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21st March 1969: Headshot of American political activist Abbie Hoffman (1936 - 1989) speaking to reporters at a press conference. (Photo by Jack Manning/New York Times Co./Getty Images)

21st March 1969:  Headshot of American political activist Abbie Hoffman (1936 - 1989) speaking to reporters at a press conference.  (Photo by Jack Manning/New York Times Co./Getty Images)

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9th November 1970: Political activist Abbie Hoffman (1936 - 1989), wearing a shirt made from an American flag, speaks at a US flag-themed art show at the Hudson Memorial Church, New York City. Hoffman was charged with desecration of the flag for wearing a US flag shirt. (Photo by Tyrone Dukes/New York Times Co./Getty Images)

9th November 1970:  Political activist Abbie Hoffman (1936 - 1989), wearing a shirt made from an  American flag, speaks at a US flag-themed art show at the Hudson Memorial Church, New York City. Hoffman was charged with desecration of the flag for wearing a US flag shirt.  (Photo by Tyrone Dukes/New York Times Co./Getty Images)

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1970: Headshot of American political activist Abbie Hoffman (1936 - 1989). (Photo by New York Times Co./Getty Images)

1970:  Headshot of American political activist Abbie Hoffman (1936 - 1989).  (Photo by New York Times Co./Getty Images)

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17th September 1980: American author and political activist Abbie Hoffman (1936 - 1989), leader of the counter culture group The Yippies in the 1960's, at a press conference at the offices of his publishers G P Puttnam in New York. (Photo by Keystone/Getty Images)

17th September 1980:  American author and political activist Abbie Hoffman (1936 - 1989), leader of the counter culture group The Yippies in the 1960's, at a press conference at the offices of his publishers G P Puttnam in New York.  (Photo by Keystone/Getty Images)