The Labor Management Relations Act of 1947, better known as the Taft–Hartley Act, is a United States federal law that restricts the activities and power of labor unions. It was passed over a veto of President Truman. The Taft–Hartley Act restricted union actions and designating new union-specific unfair labor practices. Among the practices prohibited by the Taft–Hartley act are strikes, boycotts, picketing, and closed shops.