Emerson Hugh De Lacy was an American politician and socialist. He served on the Seattle City Council from 1937 to 1940 and as a member of the United States House of Representatives from 1945 to 1947. He represented the First Congressional District of Washington as a Democrat.

The Washington Commonwealth Federation (WCF) was a political pressure group established in the American state of Washington in 1934 as "Commonwealth Builders, Incorporated" (CBI). The organization changed its name to Washington Commonwealth Federation in 1935. The organization did not run political candidates in its own name but rather functioned as an organized faction in the Washington State Democratic Party.