Joe Simon and Jack Kirby’s work on Police Trap has been well-documented at The Jack Kirby Museum. The collaborators watched their publisher fall to pieces, and they found Charlton was willing to help continue the title. Police Trap #5 was the first Charlton issue, but it would only last through #6.
Collector’s Guide: From Police Trap #5; 1955, Charlton
Mars Will Send No More 