“This phrase was penned by Britain’s official Communist Party newspaper Daily Worker, and since the 1940’s spread through socialist and communist circles.”
http://apcheck.blogspot.com/2009/09/equal-work-for-equal-pay.html
there was an episode of seinfeld that involved this theme. . Elaine’s boyfriend read the Daily Worker. Gives Kramer the propaganda.
http://www.seinfeldscripts.com/TheRace.html