Congress also amended the National Labor Relations Act, as part of the same piece of legislation that created the LMRDA, by tightening the Taft–Hartley Act's prohibitions against secondary boycotts and prohibiting certain types of "hot cargo" agreements, under which an employer agreed to cease doing business with other employers, and empowered the General Counsel of the National Labor Relations Board to seek an injunction against a union that engages in recognitional picketing of an employer for more than thirty days without filing a petition for representation with the NLRB.