The Youth International Party, whose members were commonly called Yippies, was a radically youth-oriented and countercultural revolutionary offshoot of the free speech and anti-war movements of the 1960s. It was founded on December 31, 1967. They employed theatrical gestures, such as advancing a pig (“Pigasus the Immortal”) as a candidate for President in 1968, to mock the social status quo. They have been described as a highly theatrical, anti-authoritarian and anarchist youth movement of “symbolic politics”.
Since they were well known for street theater and politically themed pranks, many of the “old school” political left either ignored or denounced them. According to ABC News, “The group was known for street theater pranks and was once referred to as the ‘Groucho Marxists’.”