One would assume that’s the John Sinclair who was the manager of MC5 and was the reason for the first Hash Bash. From his Wikipedia entry:
After a series of convictions for possession of marijuana, Sinclair was sentenced to 10 years in prison in 1969 after giving two joints to an undercover narcotics officer.[6] This sentence inspired Abbie Hoffman to jump on the stage during The Who’s performance at Woodstock to protest. It also sparked the landmark “John Sinclair Freedom Rally” at Ann Arbor’s Crisler Arena in December 1971. The event brought together luminaries including rock musicians John Lennon (who recorded the song “John Sinclair” on his Some Time in New York City album[7]), Yoko Ono, David Peel, Stevie Wonder, Phil Ochs and Bob Seger, jazz artists Archie Shepp and Roswell Rudd, and speakers Allen Ginsberg, Abbie Hoffman, Rennie Davis, David Dellinger, Jerry Rubin, and Bobby Seale.[8][9] Three days after the rally, Sinclair was released from prison when the Michigan Supreme Court ruled that the state’s marijuana statutes were unconstitutional.[10] These events inspired the creation of Ann Arbor’s annual pro-legalization Hash Bash rally, which continues to be held as of 2013, and contributed to the drive for decriminalization of marijuana under the Ann Arbor city charter (see Cannabis laws in Ann Arbor, Michigan).
