While practicing medicine and surgery in Boston , he became involved in politics , associating with John Hancock , Samuel Adams , and other leaders of the broad movement labeled Sons of Liberty . Warren conducted an autopsy on the body of young Christopher Seider in February 1770 , and was a member of the Boston committee that assembled a report on the following month 's Boston Massacre . Earlier , in 1768 , Royal officials tried to place his publishers Edes and Gill on trial for an incendiary newspaper essay Warren wrote under the pseudonym '' A True Patriot '' , but no local jury would indict them
Boston Massacre
Boston Massacre
Joseph Warren