Home ⇒ Security ⇒ Local Defense / Security Guardian Angels The Guardian Angels is a vigilante crime fighting organization . It was started by Curtis Sliwa in 1979 in New York City, and were originally ... San Francisco Patrol Special Police The San Francisco Patrol Special Police is a private security organization in San Francisco. They have been in existence since 1847 , since before it ... Stub Article: Threat Management Center (Detroit) Background The Threat Management Center (TMC) is a private security company located in Detroit, Michigan. Founded by Dale Brown in 1995, TMC performs many of ...