Inspired by that notorious Pennsylvania swim club.
Segregation (n) - From the Latin segregare composed of se- (apart) and grege (herd or flock). Segregation is to place apart from the flock. In use for forced religious separation from the 16th century. Became a euphemism for Jim Crow Laws in the 1940's.
Jim Crow (n) - A derogatory term for an ubiquitous black man, like John Doe. From a black-face minstrel character and song that first appeared in print in 1828. Used to describe segregation laws from 1842.
An example: In 1956, the Huntsville, Ala., City Council passed a resolution that made it unlawful for white and blacks to play cards, dice, dominoes, checkers, pool, billiards, softball, basketball, baseball, football, golf, or track together. Also applied to swimming pools and beaches.