During the 1940s a media reform movement of grassroots activists and a progressive Federal Communication Commission (FCC) emerged to challenge the commercial interests consolidating control of US media. A key initiative born out of this movement was the so-called Blue Book, a high-water mark for FCC progressive activism that mandated social responsibility obligations for broadcasters in return for their use of the public airwaves. Ultimately, red-baiting tactics defeated the policy initiatives outlined in the Blue Book and the media reform movement was largely contained. The following analysis draws from archival materials to illuminate the resulting arrangement for US broadcasters.