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.

"[2] As a result of heavy unemployment from the 1873–1878 national depression, Sand Lot rallies erupted in San Francisco that led to the Party's formation in 1877.

They also rewrote the state's constitution, denying Chinese Americans voting rights in California.

[failed verification][5] The party took particular aim against cheap Chinese immigrant labor and the Central Pacific Railroad which employed them.

"[8] Kearney's attacks against the Chinese were of a particularly virulent and openly racist nature, and found considerable support among white Californians of the time.