The United States faced multiple waves of political violence during the Cold War. The first would occur as a result of the reemergence of the Ku Klux Klan in 1950, in opposition to the growing civil rights movement, which sought an end to racial segregation and other forms of racism. The new Klan also gained a new anti-communist and neo-fascist element, in response to the rise of anti-communist ideas in American society as a result of the Red Scare. Other white supremacist organizations would arise at the same time, such as the American Nazi Party. In Puerto Rico, the Puerto Rican Nationalist Party would launch a series of revolts throughout the 50s, including an attempted assassination of Harry S. Truman. In the early 60s, standoffs between federal and state governments would result in events such as the Little Rock Crisis and the Ole Miss riot of 1962.

Political violence in the United States would increase throughout the 60s and 70s, which included the rise of many left-wing militant groups such as Weather Underground, the Black Panther Party, the Symbionese Liberation Army, and the May 19th Communist Organization. Some of which (chiefly the WUO and M19), would launch a series of bombings against various targets, mainly those associated with the federal government. Clashes between demonstrators and the police would be a major aspect of the protests against the US' involvement in the Vietnam War, culminating in the Kent State massacre and the Jackson State killings, both perpetrated by the National Guard. Events dubbed the "Ghetto riots" would occur throughout the 60s as a backlash against racial discrimination in impoverished mostly-African American neighborhoods.

Racist backlash against the civil rights movement and the Black Power movement would continue in the form of the 16th Street Baptist Church bombing by four members of the KKK and the later Greensboro massacre in 1979. 1968 is often highlighted as a particularly chaotic year in American history, which included an escalation of the Vietnam War, the widely televised 1968 Democratic National Convention protests, and the assassinations of both Robert F. Kennedy and Martin Luther King Jr.

The federal government would commit acts of illegal surveillance against movements considered subversive as part of its COINTELPRO operation from 1956 to 1971, which allegedly backed militant anti-communist organizations, such as Secret Army Organization. Clashes between police and organizations associated with the Black Power movement would culminate in the 1985 MOVE bombing, committed by the Philadelphia Police Department, resulting in the deaths of 11 and the partial destruction of the neighborhood of Cobbs Creek. Attacks committed by left-wing organizations would largely end the same year, with the dissolution of M19. The rise of white supremacist and Neo-Nazi prison gangs throughout the 70s and 80s would result in multiple murders motivated by antisemitism including the murder of the Goldmark family and of Alan Berg.

Many assassinations would occur in the United States at this time, including those of Medgar Evers, John F. Kennedy, Malcolm X, George Lincoln Rockwell, Martin Luther King Jr., Robert F. Kennedy, Fred Hampton, Huey P. Newton, and Alan Berg.

Events and incidents

Aftermath
The Greensboro massacre has been credited by some as having resulted in the convergence of disparate white supremacist ideologies in the United States and forming the precursor of modern far-right movements, such as the alt-right.

See also
 Terrorism in the United States
 List of incidents of civil unrest in the United States
 Years of Lead (Italy)
 The Troubles
 Operation Gladio
 COINTELPRO

Notes

References 

History of the United States
Political violence in the United States
Riots and civil disorder in the United States
Terrorism in the United States
Communist terrorism
Neo-fascist terrorism
Dirty wars
Guerrilla wars