New type of flare gun used by police.

Similar Images from the Collection

Superintendent Mitchell Crowley with machine gunners at headquarters. They are ready for big May Day riots
Riot guns at Boston Police headquarters
Inspecting riot guns and gas masks in police headquarters
Inspecting new riot guns at police headquarters
G-men get rid of old guns.
Police mount guard over own arsenal. L-R: John H. Cloran / Francis J. McNeil / Edward J. Siebold.