Doyle Security Historical Photos Gallery 2 Here is a collection of historical photos from Doyle Security's long history since 1919... John A. Doyle Carl Hallauer, Com. Mulroney, J. Edgar Hoover and John A. Doyle. John A. Doyle and guards from Doyle Detective Group, 1920 John A. Doyle 1924 Doyle Detective Bureau Guards     J. Gregory Doyle, President of Doyle Detective Bureau Doyle Detective Bureau Advertisement, 1970s John G. Doyle     Back to Photo Gallery