Harry Wellington Laidler was an American socialist writer, magazine editor, and politician. He is best remembered as executive director of the League for Industrial Democracy, successor to the Intercollegiate Socialist Society, and for his close political association with perennial Socialist Party Presidential nominee Norman Thomas. He also served a two-year term on the New York City Council.

The American Labor Party (ALP) was a political party in the United States established in 1936 that was active almost exclusively in the state of New York. The organization was founded by labor leaders and former members of the Socialist Party of America who had established themselves as the Social Democratic Federation (SDF). The party was intended to parallel the role of the British Labour Party, serving as an umbrella organization to unite New York social democrats of the SDF with trade unionists who would otherwise support candidates of the Republican and Democratic parties.