The Workingmen's Party of California (WPC) was an American labor organization, founded in 1877 and led by Denis Kearney, J. G. Day, and H. L. Knight.

Denis Kearney (1847–1907) was a California labor leader from Ireland who was active in the late 19th century and was known for his anti-Chinese activism. Called "a demagogue of extraordinary power," he frequently gave long and caustic speeches that focused on four general topics: contempt for the press, for capitalists, for politicians, and for Chinese immigrants. A leader of the Workingmen's Party of California, he is known for ending all of his speeches with the sentence "And whatever happens, the Chinese must go"