The Committee for Industrial Organization, the precursor to the Congress of Industrial Organizations, is founded in Atlantic City, New Jersey, by eight trade unions belonging to the American Federation of Labor.

The Congress of Industrial Organizations (CIO) was a federation of unions that organized workers in industrial unions in the United States and Canada from 1935 to 1955. Originally created in 1935 as a committee within the American Federation of Labor (AFL) by John L. Lewis, a leader of the United Mine Workers (UMW), and called the Committee for Industrial Organization. Its name was changed in 1938 when it broke away from the AFL. It focused on organizing unskilled workers, who had been ignored by most of the AFL unions.

Atlantic City, sometimes referred to by its initials A.C., is a Jersey Shore seaside resort city in Atlantic County, in the U.S. state of New Jersey.

A trade union or labor union, often simply referred to as a union, is an organization of workers whose purpose is to maintain or improve the conditions of their employment, such as attaining better wages and benefits, improving working conditions, improving safety standards, establishing complaint procedures, developing rules governing status of employees and protecting and increasing the bargaining power of workers.

The American Federation of Labor was a national federation of labor unions in the United States that continues today as the AFL-CIO. It was founded in Columbus, Ohio, in 1886 by an alliance of craft unions eager to provide mutual support and disappointed in the Knights of Labor. Samuel Gompers was elected the full-time president at its founding convention and was re-elected every year except one until his death in 1924. He became the major spokesperson for the union movement.