thank you hallmark

At around 10:30 a.m. on St. Valentine's day, four members of the Burke gang drove to the warehouse in two cars; a Cadillac sedan and a Peerless, both outfitted to look like detective sedans. Two men were dressed in police uniforms and two in street clothes. The Moran Gang had already arrived at the warehouse. However, Moran himself was not inside. One account states that Moran was supposedly watching the warehouse, spotted the police car, and fled the scene. Another account was that Moran was simply late getting there.

Byron Bolton confused one of Moran's men for Moran himself; he then signaled Burke's men they approached the warehouse. The two phony police, carrying shotguns, exited the Peerless and entered the warehouse through the two rear doors. Inside they found members of Moran's gang, a sixth man named Reinhard Schwimmer who was not actuallly a gangster, but more of a gang "hanger-on" and a seventh man, John May, who was a mechanic fixing one of the cars, and not a gangster at all. The killers told the seven men to line up facing the back wall; there was apparently no resistance, as the Moran men thought their captors were real cops, and it was likely a "show" bust merely to garner good press for the police department.

Then the two "police officers" let in two men through the front door facing Clark Street. This pair, riding in the Cadillac, were dressed in civilian clothes. Two of the killers starting shooting with Thompson sub-machine guns. All seven men were killed in a storm of seventy machine-gun bullets and two shotgun blasts according to the coroner's report.[2]

To show by-standers that everything was under control, the pair in street clothes came out with their hands up, led by the two uniformed cops. The only survivor in the warehouse was John May's German Shepherd, Highball. When the real cops arrived, they first heard the dog howling. On entering the warehouse, they found the dog trapped under a beer truck and the floor covered with blood, shell casings, and corpses.

source: http://en.wikipedia.org/wiki/Valentines_Day_Massacre