Radio was introduced commercially in 1920, when the Westinghouse Corp. launched station KDKA in Pittsburg. Other stations followed. Because transmission frequencies could be chosen arbitrarily, stations interfered with one another’s broadcasts. The system became chaotic; listeners could hear two stations simultaneously. The Federal government stepped in with the Radio Act of 1927, which created the Federal Radio Commission (FRC) to assign frequencies, limit interference, and regulate ownership. Most important, this act declared that the airwaves belonged to the public.