Abbot Howard Hoffman (November 30, 1936 – April 12, 1989) 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. As a member of the Chicago Seven, Hoffman was charged with and tried―for activities during the 1968 Democratic National Convention―for conspiring to use interstate commerce with intent to incite a riot and crossing state lines with the intent to incite a ri