Members of the Writers Guild of America, East, and Writers Guild of America, West—labor organizations representing television, film and radio writers—go on strike in Los Angeles and New York after negotiations break down with the Alliance of Motion Picture and Television Producers (AMPTP), a trade group that represents TV and film producers in the United States, including CBS, NBC Universal, Walt Disney Company, Paramount Pictures, News Corp., Sony Pictures Entertainment, MGM and Warner Brothers. The strike caused production to shut down on more than 60 TV shows and resulted in a loss of $3 billion, by some estimates, to the Los Angeles economy alone.