In what year did the U.S. Supreme Court support the authority of the IBEW Constitution?

The U.S. Supreme Court supported the authority of the International Brotherhood of Electrical Workers (IBEW) Constitution in 1963. This was a significant ruling that emphasized the union's governance and its power to enforce its own constitution, thereby reinforcing the importance of union bylaws and the legal backing they have in labor relations. This support from the Supreme Court helped affirm the legitimacy of the IBEW's internal regulations and procedures, ensuring that members were held to the standards set forth by their governing documents. This landmark decision played a crucial role in shaping labor law and union governance in the United States, establishing a precedent for the authority of union constitutions as binding and judicially enforceable.