In the wake of Dragnet's success for NBC (after having been rejected by CBS), radio audiences more and more craved authenticity from their crime dramas. Programs like Gang Busters (1936-1957) and This is Your FBI (1945-1953) claimed to be based on authentic cases, but were less realistic and adult in tone than the true crime series of the 1950s. Most of the scores of earlier hard-boiled detective shows were often utterly implausible, even when enjoyable. As they often did, in the summer of 1950, CBS and NBC went head to head with two similar programs that aimed to up the authenticity stakes, Somebody Knows and Wanted.
Somebody Knows debuted on 6 July, 1950 as that year's summer replacement for Suspense (1942-1962). Through narration and dramatizations, the known facts of unsolved crimes were presented and listeners who provided information leading to the conviction of a criminal in one of the profiled cases would get $5,000 for their effort (more than $47,000 in 2013, adjusted for inflation). Unable to find a sponsor, independent series creator Jimmy Saphier put up $40,000 of his own money. In a promotional interview Sapphier stated, "I don't care if we only have one listener. As long as he's the guy who knows who did it--and will rat on his pals."