Taft-Hartley Act is the popular name for the federal Labor-Management Relations Act of 1947. The act was named for its main sponsors, Senator Robert A. Taft and Representative Fred Hartley. It was an amendment to the Wagner Act (National Labor Relations Act of 1935). It continued the Wagner Act's basic guarantees of workers' rights, outlawed certain union tactics, and expanded the act's concept of unfair labor practices to include practices of labor organizations. The Taft-Hartley Act provided that the start of strikes which might cause a national emergency can be delayed for 80 days.