From David Sinclair obituary:
David Sinclair ran for Ann Arbor City Council in 1973. He served as the White Panthers' chief of staff and served as finance officer for the Rainbow People's Party.
FBI Director J. Edgar Hoover had David Sinclair's phone tapped in late 1970 as part of an investigation into the bombing of a CIA office in Ann Arbor. John Sinclair and two others were charged in connection with the bombing.