By that time, Gannon had already turned to the Left and became a leading member of the
Communist Party of Ireland when it was refounded in 1933. In this decision may have been influenced by
Donal O'Reilly, his lifelong companion who had been with him at the Four Courts and who already joined the Communist Party in its earlier incarnation under
Roddy Connolly. The radical left-wing commentator Jack Cleary approvingly mentions Bill Gannon as among the few IRA militants who had "given up the gun in favor of working-class politics" (in marked contrast to Gannon's aforementioned fellow-assassin
Archie Doyle, who continued to take part in IRA armed raids well into the 1940s). Being an Irish Communist in these years carried, however, its own risks. Gannon is mentioned as having been among the defenders of
Connolly House, the party's Dublin headquarters, when it was attacked – and ultimately put on fire – by a right-wing mob in 1933. And in subsequent years Communists continued to suffer constant harassment, often descending into outright violence. Gannon is at present mainly remembered for his major part in organising Irish volunteers (the
Connolly Column) to fight on the Republican side in the
Spanish Civil War, a work undertaken in close co-operation with
Frank Ryan and
Peadar O'Donnell, and which came to overshadow his earlier fame (or notoriety) in connection with the O'Higgins assassination. Gannon died on 12 September 1965, age 63, and got a well-attended party funeral, his coffin being draped with a red flag and the
Irish Tricolor flag. == References ==