J.R. Conlin insists too much has been made of the deletion of the political clause in 1908; equally significant was the rejection without discussion by the 1911 Chicago IWW Convention of an amendment to the Preamble that referred to 'the futility of political action'. The WIIU was criticized for focusing more on party propaganda than on organizing workers. From 1908 to 1922, the relationship between the IWW and the WIIU was characterized as "bitter". The One Big Union concept is the idea that all wage workers should join one great union to (1) fight for better wages, hours, and conditions, and to (2) form an organization so large and powerful that it may ultimately win a general victory over capital, conferring power to the working class. The concept was elaborated in an IWW pamphlet in 1911, and was an important theme in the IWW's literature. A new union federation, inspired by the IWW, was formed in Canada in 1919, taking the name "One Big Union" (OBU), achieving a membership of nearly fifty thousand the first year. The OBU movement came into conflict with mainstream labor, particularly John L. Lewis of the United Mine Workers. In September 2005, five decades after the AFL merged with the CIO to form the AFL-CIO, seven unions and six million workers split off to form the Change to Win Federation. Other pressures dictating the nature and power of organized labor organizations have included the evolution and power of the corporation, efforts by employers and private agencies to limit or control unions, and U.S. labor law. Political organizations sometimes see alliances with organized labor as a means to increase their effectiveness, and vice versa. The Socialist Trade and Labor Alliance (STLA) was closely linked to the Socialist Labor Party. The STLA existed from 1895 until 1905, when it played a founding role in the IWW. In 1908 the IWW modified its constitution to prohibit alliances with any political parties. When the IWW underwent a split over the issue of decentralization in the mid-1920s, roughly half of the membership left to join the Communist Party (CP). The Trade Union Educational League (TUEL) was a left wing movement inside the AFL by former Left Wing Socialists and former IWW members who became active in the American Communist movement. The TUEL "urged organization of the unorganized, more rank-and-file control of unions, federal unemployment insurance, and support of socialism." The TUEL rejected alternatives to the AFL, a policy at that time aimed at the IWW.