Abbot Howard Hoffman was an American political and social activist who co-founded the Youth International Party ("Yippies") and was a member of the Chicago Seven. He was also a leading proponent of the Flower Power movement.

The Youth International Party (YIP), whose members were commonly called Yippies, was an American youth-oriented radical and countercultural revolutionary offshoot of the free speech and anti-war movements of the late 1960s. It was founded on December 31, 1967. They employed theatrical gestures to mock the social status quo, such as advancing a pig as a candidate for President of the United States in 1968. They have been described as a highly theatrical, anti-authoritarian, and anarchist youth movement of "symbolic politics".