Domestic terrorism in the United States consists of incidents confirmed as terrorist acts. These attacks are considered domestic because they were carried out by U.S. citizens or U.S. permanent residents.
The statutory definition of domestic terrorism in the United States has changed many times over the years; also, it can be argued that acts of domestic terrorism have been occurring since long before any legal definition was set forth.
Under current United States law, set forth in the USA PATRIOT Act, acts of domestic terrorism are those which: "(A) involve acts dangerous to human life that are a violation of the criminal laws of the United States or of any State; (B) appear to be intended – (i) to intimidate or coerce a civilian population; (ii) to influence the policy of a government by intimidation or coercion; or (iii) to affect the conduct of a government by mass destruction, assassination, or kidnapping; and (C) occur primarily within the territorial jurisdiction of the United States." 
Anti-abortion violence, considered a form of terrorism, is often committed in the United States against individuals and organizations that provide abortions or abortion counseling. Incidents have included crimes against people, such as murder, assault, kidnapping, and stalking; crimes affecting both people and property, such as arson or bombing; and property crimes such as vandalism. Perpetrators may defend their actions as necessary to protect fetuses, and are often motivated by their Christian beliefs, leading to anti-abortion violence's identification as Christian terrorism; it is also associated with opposition to women's rights.
Notable incidents of anti-abortion violence include the murders of a number of doctors and clinic staff in the 1990s.
According to the FBI in June 2008, eco-terrorists and extreme animal rights activists represent "one of the most serious domestic terrorism threats in the U.S. today". They committed over 2,000 crimes and caused over $110 million in damages since 1979, against targets including lumber companies, animal testing facilities and genetic research firms.
Animal Liberation Front (ALF) is a name used internationally by activists who engage in direct action against persons and/or organizations which the activists perceive are harming animals. This includes removing animals from laboratories and fur farms, and sabotaging facilities involved in animal testing and other animal-based industries. According to ALF statements, any act that furthers the cause of animal liberation, where all reasonable precautions are taken not to endanger life, may be claimed as an ALF action. The group is listed by the U.S. Department of Homeland Security as a domestic terrorist organization.
Alpha 66 (still existent) and Omega 7 (now defunct) were two affiliated Cuban exile action groups who have carried out many bombings and acts of sabotage. While many of these attacks have historically been directed at Cuba and the Castro government, many of them occurred domestically, especially during the period of Cuba-US diplomacy and negotiations in the 1970s known as "el Diálogo" (the dialogue) when powerful anti-Castro figures in Miami attempted to terrorize those in their community who favored a more moderate approach. Luciano Nieves, for instance, was killed for advocating peaceful coexistence with Cuba. WQBA-AM news director Emilio Milian lost his legs in a car bomb after he publicly condemned Cuban exile violence. These cases of terrorism were documented extensively in the book Miami by Joan Didion. Human Rights Watch released a report in 1992 in which it claimed that the more extreme exiles have created a political environment in Miami where "moderation can be a dangerous position."
The Army of God (AOG) is a loose network of individuals and groups connected by ideological affinity and the determination to use force to end abortion in the United States. Acts of anti-abortion violence increased in the mid-1990s culminating in a series of bombings by Eric Robert Rudolph, whose targets included two abortion clinics, a gay and lesbian night club, and the 1996 Olympics in Atlanta. Letters sent to newspapers claim responsibility for the bombing of the abortion clinics in the name of the Army of God.
Aryan Nations (AN) is a white nationalist neo-Nazi organization founded in the 1970s by Richard Girnt Butler as an arm of the Christian Identity group known as the Church of Jesus Christ-Christian. As of December 2007 there were two main factions that claimed descent from Butler's group. The Aryan Nations has been called a "terrorist threat" by the FBI, and the RAND Corporation has called it the "first truly nationwide terrorist network" in the United States.
A splinter group made up of the more radical members of the Black Panther Party, the Black Liberation Army (BLA) sought to overthrow the US government in the name of racial separatism and Marxist ideals. The Fraternal Order of Police blames the BLA for the murders of 13 police officers. According to a Justice Department report on BLA activity, the group was suspected of involvement in over 60 incidents of violence between 1970 and 1980.
The Covenant, The Sword, and the Arm of the Lord (CSA) was a radical Christian Identity organization formed in 1971 in the small community of Elijah in southern Missouri, United States. One of its members, Richard Wayne Snell was responsible for the murder of a pawnshop owner and a Missouri state trooper. The CSA collapsed following an FBI and ATF siege in 1985.
The Jewish Defense League (JDL) was founded in 1968  by Rabbi Meir Kahane in New York City. FBI statistics show that, from 1980 to 1985, 15 terrorist attacks were attempted in the U.S. by JDL members. The FBI’s Mary Doran described the JDL in 2004 Congressional testimony as "a proscribed terrorist group". The National Consortium for the Study of Terror and Responses to Terrorism states that, during the JDL's first two decades of activity, it was an "active terrorist organization." Kahane later founded the far right Israeli political party Kach.
During reconstruction at the end of the civil war the original KKK used domestic terroristic methods against the Federal Government and against freed slaves. During the 20th century, leading up to the Civil Rights Movement, unrelated Ku Klux Klan (KKK) groups used threats, violence, arson, and murder to further their anti-Black, anti-Catholic, anti-Communist, anti-semitic, and white-supremacist agenda. Domestic terrorists with agendas similar to the KKK include neo-Nazis and white power skinheads.
The May 19 Coalition (also variously referred to as the May 19 Communist Coalition, May 19 Communist Organization, and various alternatives of M19CO), was a US-based, self-described revolutionary organization formed by members of the Weather Underground Organization. The group was originally known as the New York chapter of the Prairie Fire Organizing Committee (PFOC), an organization devoted to legally promoting the causes of the Weather Underground. This was part of Prairie Fire Manifesto change in Weather Underground Organization strategy, which demanded both aboveground mass and clandestine organizations. The role of the clandestine organization would be to build the "consciousness of action" and prepare the way for the development of a people's militia. Concurrently, the role of the mass movement (i.e., above ground Prairie Fire Collective) would include support for, and encouragement of, armed action. Such an alliance would, according to Weather, "help create the 'sea' for the guerrillas to swim in."
The Order, also known as the Brüder Schweigen or Silent Brotherhood, was an organization active in the United States between 1983 and 1984. The Order, a white nationalist revolutionary group, is probably best known for the 1984 murder of radio talk show host Alan Berg, but the group also carried out several bank and car robberies, three murders, and money counterfeiting until their leader, Robert Jay Mathews, was killed in a shootout with FBI agents on Whidbey Island, Washington, in December 1984.
The Phineas Priesthood (Phineas Priests) is a Christian Identity movement that opposes interracial sex, the mixing of races, homosexuality, and abortion. It is also marked by its anti-Semitism, anti-multiculturalism, and opposition to taxation. It is not considered an organization because it is not led by a governing body, there are no gatherings, and there is no membership process. One becomes a Phineas Priest by simply adopting the beliefs of the Priesthood and acting upon those beliefs. Members of the Priesthood are often called terrorists for, among other things, planning to blow up FBI buildings, abortion clinic bombings, and bank robberies.
The Symbionese Liberation Army (SLA) was an American self-styled, far left "urban guerrilla warfare group" that considered itself a revolutionary vanguard army. The group committed bank robberies, two murders, and other acts of violence between 1973 and 1975. Among their most notorious acts was the kidnapping of the newspaper heiress Patty Hearst.
The United Freedom Front (UFF) was a small American Marxist organization active in the 1970s and 1980s. It was originally called the Sam Melville/Jonathan Jackson Unit, and its members became known as the Ohio 7 when they were brought to trial. Between 1975 and 1984 the UFF carried out at least 20 bombings and nine bank robberies in the northeastern United States, targeting corporate buildings, courthouses, and military facilities. Brent L. Smith describes them as "undoubtedly the most successful of the leftist terrorists of the 1970s and 1980s." The group's members were eventually apprehended and convicted of conspiracy, murder, attempted murder, and other charges. Two, Tom Manning and Jaan Laaman, remain incarcerated today.
The Weather Underground Organization was a far left organization active from 1969 to 1975. It originated in 1969 as a faction of Students for a Democratic Society (SDS) composed for the most part of the national office leadership of SDS and their supporters. The group collapsed shortly after the U.S. withdrawal from Vietnam in 1975.
The Mountain Meadows massacre was a series of attacks on the Baker–Fancher emigrant wagon train, at Mountain Meadows in southern Utah. The attacks began on September 7 and culminated on September 11, 1857, resulting in the mass slaughter of the emigrant party by members of the Utah Territorial Militia from the Iron County district, a Mormon group, together with some Paiute Native Americans. Intending to leave no witnesses and thus prevent reprisals, the perpetrators killed all the adults and older children – about 120 men, women, and children in total. Seventeen children, all younger than seven, were spared.
The Los Angeles Times bombing was the purposeful dynamiting of the Los Angeles Times building in Los Angeles, California, on October 1, 1910 by a union member belonging to the International Association of Bridge and Structural Iron Workers. The explosion started a fire which killed 21 newspaper employees and injured 100 more.
The Wall Street bombing was a terrorist incident that occurred on September 16, 1920, in the Financial District of New York City. A horse-drawn wagon filled with 100 pounds (45 kg) of dynamite was stationed across the street from the headquarters of the J.P. Morgan Inc. bank. The explosion killed 38 and injured 400. Even though no one was found guilty, it is believed that the act was carried out by followers of Luigi Galleani.
On May 31 and June 1, 1921, a white mob started the Tulsa race riot, attacking residents and businesses of the African-American community of Greenwood in Tulsa, Oklahoma, in what is considered one of the worst incidents of racial violence in United States History. The attack, carried out on the ground and by air, destroyed more than 35 blocks of the district, did $30 million (2017 dollars) in damages, left 10,000 people homeless and up to 300 dead in a town considered the wealthiest black community in the nation.
From 1978 to 1995, Harvard University graduate and former mathematics professor Theodore "Ted" Kaczynski – known by the codename "UNABOM" until his identification and arrest by the FBI – carried out a campaign of sending letterbombs to academics and various individuals particularly associated with modern technology. In 1996, his manifesto was published in The New York Times and The Washington Post, under the threat of more attacks. The bomb campaign ended with his capture.
In a 2004 congressional testimony, John S. Pistole, Executive Assistant Director for Counterterrorism and Counterintelligence for the Federal Bureau of Investigation described the JDL as "a known violent extremist Jewish Organization." FBI statistics show that, from 1980 through 1985, there were 18 terrorist attacks in the U.S. committed by Jews; 15 of those by members of the JDL. Mary Doran, an FBI agent, described the JDL in a 2004 Congressional testimony as "a proscribed terrorist group". Most recently, then-JDL Chairman Irv Rubin was jailed while awaiting trial on charges of conspiracy in planning bomb attacks against the King Fahd Mosque in Culver City, California, and on the office of Arab-American Congressman Darrell Issa. In its report, Terrorism 2000/2001, the FBI referred to the JDL as a "violent extremist Jewish organization" and stated that the FBI was responsible for thwarting at least one of its terrorist acts.
This truck bomb attack by Timothy McVeigh and Terry Nichols killed 168 people on April 19, 1995 – the deadliest domestic-based terrorist attack in the history of the United States. It inspired improvements to United States federal building security.
The Centennial Olympic Park bombing was a terrorist bombing on July 27, 1996 in Atlanta, Georgia, United States during the 1996 Summer Olympics, the first of four committed by Eric Robert Rudolph, former explosives expert for the United States Army. Two people died, and 111 were injured.
On August 5, 2012, Wade Michael Page fatally shot six people and wounded four others in a mass shooting at a Sikh temple in Oak Creek, Wisconsin. Page was an American white supremacist and a United States Army veteran from Cudahy, Wisconsin. All of the dead were members of the Sikh faith.
On April 15, 2013, two homemade bombs detonated 12 seconds and 210 yards apart at 2:49 p.m., near the finish line of the annual Boston Marathon, killing three people and injuring several hundred others, including 16 who lost limbs.
On June 17, 2015, Dylann Roof, a 21-year-old white supremacist, went into the Emanuel African Methodist Episcopal Church in Charleston, South Carolina and shot and killed nine people. Roof was a known to be a white supremacist and owned a website where he wrote a manifesto in which he outlined his views toward blacks, among other peoples.
On December 2, 2015, 14 people were killed and 22 injured in a mass shooting at the Inland Regional Center in San Bernardino, California, United States. Syed Rizwan Farook and Tashfeen Malik targeted a San Bernardino County Department of Public Health training event and holiday party of about 80 employees in a rented banquet room. Farook was an American-born citizen of Pakistani descent, while his wife was a Pakistani-born legal resident of the U.S. He had attended the event as an employee before the shooting. Both had become radicalized through jihadist material on the internet, and stockpiled supplies in their home.
On June 12, 2016, 49 people were killed and 53 were injured at the Pulse nightclub in Orlando, Florida by a 29-year-old Omar Mateen, and a person of interest to the FBI in 2013 and 2014. This became the deadliest mass shooting in modern United States history and the deadliest terrorist attack on US soil since the 9/11 attacks.
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