The Labor Management Relations Act (LMRA), also known as the Taft-Hartley Labor Act, was passed in 1947. The LMRA amended the National Labor Relations Act (NLRA) of 1935 and nullified parts of the Federal Anti-Injunction Act of 1932. It greatly impeded the work of labor unions in the US. The LMRA forbidsw jurisdictional strikes, wildcat strikes, solidarity strikes, secondary boycotts, picketing, closed and union shops, and donations by unions to federal political campaigns. It also required union officials to sign non-communist affidavits with the federal government. The LMRA gave the executive branch power to break a strike if it was deemed that the strike "imperiled the national health or safety". It also expanded the powers of the National Labor Relations Board (NLRB), established after the passage of the NLRA to enforce unfair labor practices. There have been numerous attempts to repeal this law, which have been unsuccessful, but the Landrum-Griffin Act (1959) amended some features of the Taft-Hartley.