Following a year of highly publicised peace campaigning by the Lennons in 1969, Apple press officer Derek Taylor was concerned that they had exhausted the media's interest in their causes. On 4 February 1970, Lennon and Ono staged a publicity stunt at the Black Centre in north London, where they donated a large plastic bag full of their hair, along with Apple's poster for the new single, to black power activist Michael X, in return for a pair of Muhammad Ali's bloodstained boxing shorts. The "final proof" of the Lennons' "overexpose", according to Taylor, was that there was a large press turnout for the event, yet "nobody printed anything".