<P> The two "police officers" then signaled to the pair in civilian clothes who had accompanied them . Two of the killers opened fire with Thompson sub-machine guns, one with a 20 - round box magazine and the other a 50 - round drum . They were thorough, spraying their victims left and right, even continuing to fire after all seven had hit the floor . Two shotgun blasts afterward all but obliterated the faces of John May and James Clark, according to the coroner's report . </P> <P> To give the appearance that everything was under control, the men in street clothes came out with their hands up, prodded by the two uniformed police officers . Inside the garage, the only survivors in the warehouse were Highball (May's dog) and Frank Gusenberg . Despite fourteen bullet wounds, he was still conscious, but died three hours later, refusing to utter a word about the identities of the killers . The Valentine's Day Massacre set off a public outcry that posed a problem for all mob bosses . </P> <Ul> <Li> Peter Gusenberg, a frontline enforcer for the Moran organizations . </Li> <Li> Frank Gusenberg, the brother of Peter Gusenberg and also an enforcer . </Li> <Li> Albert Kachellek (alias "James Clark"), Moran's second - in - command . </Li> <Li> Adam Heyer, the bookkeeper and business manager of the Moran gang . </Li> <Li> Reinhardt Schwimmer, an optician who had abandoned his practice to gamble on horse racing and associated with the gang . </Li> <Li> Albert Weinshank, who managed several cleaning and dyeing operations for Moran . His resemblance to Moran, including the clothes he was wearing, is what allegedly set the massacre in motion before Moran actually arrived . </Li> <Li> John May, an occasional car mechanic for the Moran gang . </Li> </Ul> <Li> Peter Gusenberg, a frontline enforcer for the Moran organizations . </Li>

Who was killed at the st valentine day massacre