One of the most well-known departments was the Industrial Union Department (IUD). It had been constitutionally mandated by the new AFL–CIO constitution created by the merger of the AFL and CIO in 1955, as CIO unions felt that the AFL's commitment to industrial unionism was not strong enough to permit the department to survive without a constitutional mandate. For many years, the IUD was a "de facto" organizing department in the AFL–CIO. For example, it provided money to the near-destitute American Federation of Teachers (AFT) as it attempted to organize the United Federation of Teachers in 1961. The organizing money enabled the AFT to win the election and establish its first large collective bargaining affiliate. For many years, the IUD remained rather militant on a number of issues. It proved to be a center of opposition to AFL–CIO president John Sweeney, and was abolished in 1999.