 During the mid to late 1920s, Belcastro was suspected of causing over 100 deaths while bombing saloons that refused to buy alcohol from Capone.During the 1927 Chicago primary elections—the so-called "Pineapple Primary"—Belcastro launched a bombing campaign against the opponents of Capone ally and Mayor, William Hale Thompson.He primarily attacked voting stations in wards where opinion was thought to oppose Thompson.