77 Sunset Strip (1958)

S1E31 Downbeat

After being cleared of sedition charges due to insufficient evidence, Stu Bailey finds himself without his private investigator's license and spirals into a binge of drinking. During this tumultuous time, an old acquaintance approaches him with an opportunity to engage in dealings with Communists. Ultimately, it is disclosed that Bailey has been operating undercover for the U.S. government throughout the entire ordeal.