The show was broadcast live.
This TV crime series was aired from 1951-55 in the time slot before the ever popular Dragnet (1951) on NBC's Thursday night lineup.
Season 1 of "Treasury Men in Action" aired from September 11, 1950, through April 1951 on ABC, where it was broadcast live. Season 2, 3 and 4 aired on NBC, where it was broadcast live from April 5, 1951 to April 1, 1954 before being canceled despite finishing #15 in the Nielsen ratings. ABC picked the show back up for Season 5, and switched from broadcasting live to filmed episodes.