American Federation of Labor (AFL), federation of North American labour unions that was founded in 1886 under the leadership of Samuel Gompers as the successor to the Federation of Organized Trades (1881), which had replaced the Knights of Labor (KOL) as the most powerful industrial union of the era. The AFL focused on the organization of skilled workers and remained the sole unifying agency of the American labour movement for some 50 years. In 1955 it merged with the Congress of Industrial Organizations (CIO), which had split from the AFL in 1938, to form the American Federation of Labor–Congress of Industrial Organizations (AFL–CIO).
For most of the 19th century, the American labour movement had two components: a labour-reform branch, which fought for equal rights for workers in a world divided into the rich and the poor, and the trade unions, which pursued higher wages for workers and addressed their day-to-day needs. During the 1880s the functional separation between the two strands began breaking down. Craft (skill-based) unions came to dominate the trade-union structure and became increasingly territorial. At the same time the KOL, which had previously focused on labour-reform issues, began conducting strikes and organizing workers along industry-wide rather than craft lines, effectively performing as a rival trade-union movement. Moreover, in attempting to incorporate the existing craft unions, the KOL limited their autonomy and pulled them into political and social disputes that did not directly involve their own interests.
In December 1886, after the KOL rejected a proposal reaffirming the historic separation of trade-union and labour-reform functions, the craft unions revolted. Led by Samuel Gompers, an English immigrant who had organized cigar makers, the craft unions established the American Federation of Labor. Dedicated to the principles of craft unionism, the AFL brought together some 100 national and international unions, which were allowed to remain autonomous. Each union was granted “exclusive jurisdiction” over a craft. This allocation sparked some heated jurisdictional disputes between the federation’s affiliated unions, but it did not prevent union membership from growing.
Guided by Gompers and a clutch of Marxist trade unionists, the AFL embraced “pure and simple” unionism as its credo. Unlike the KOL, the AFL was not immersed in national political issues. Instead, it focused on obtaining the right to bargain collectively for wages, benefits, hours, and working conditions. The pursuit of labour reform was removed from the agenda of American workers. The weapons in their struggle were to be economic and not political. Henceforth, the participants in that struggle would be wage workers organized along occupational lines.
Gompers, who served as president of the AFL from 1886 to 1924 (except for one year, 1895), kept the AFL politically neutral until pressed by employer tactics such as the creation of open shops (workplaces that require neither union membership nor dues payment) and by federal court decisions that undermined labour’s key economic weapons: the strike, the picket line, and the boycott. The election of Democrat Woodrow Wilson as U.S. president in 1912 improved the political climate for labour, but his Republican successors in the White House reversed the field. Union enrollments slowed from the start of the Great Depression into the early 1930s; however, the administration of Pres. Franklin D. Roosevelt gave rise to new opportunities for labour. In particular the passage of the Wagner Act (1935) blocked employers from interfering with union activities. Moreover, it established the National Labor Relations Board to support union organization and collective bargaining. A new era of unprecedented growth for the labour movement followed.
As the 20th century progressed, craft unions began losing ground to industrial unions. The AFL responded during the mid-1930s by opposing attempts to organize the unskilled and ultimately expelled a group of member unions that were attempting to do so. The expelled unions formed the Congress of Industrial Organizations in 1938. By 1941 the CIO had assured the success of industrial unionism by organizing the steel and automobile industries. In 1955 the AFL and the CIO merged to form the AFL–CIO. Together they represented about 15 million workers.