G-Men was launched by Standard Magazines in 1935 and rapidly established itself as the most popular of those featuring federal agent crime stories. It ran for 53 monthly issues until Feb-1940 at which point the decline of interest in "G-Man" stories caused a slight change in title to G-Men Detective and a shift to a bimonthly schedule (occasionally falling to quarterly) which it maintained for a further 59 issues until the magazine stopped in Winter 1953