The Untouchables (1959) : 3x19

Chicago, August 29, 1934. That night, in the Haymarket district, special agent Daniel Gosden, a policeman on loan to the Untouchables, goes through a skylight and finds an opium laboratory in the top floor of a rundown tenement hotel. Just then, drug lord Victor Rait and 4 hoods (Gus, Sully, Max, and Trapp) show up, carrying crates of supplies into the place. Rait spots Gosden and gives chase; just as Gosden phones Ness for back-up, Rait blows him away with a shotgun. Then Rait blasts 6 bullets from his gun to disperse the crowd of tenants investigating the noise. Somebody phones the cops, because within minutes Eliot Ness and his men and some policemen are on the scene.