Rock Against Communism (RAC) is a euphemism used to refer to several types of white power/hate music (typically Oi! or hatecore punk). Despite its name, RAC more often than not contains no references to "Communism" at all, but focuses on racism and anti-Semitism. The term emerged in the late 1970s and early 1980s, after rock music promoters in Great Britain put on a series of "Rock against Racism" concerts. In response, various white supremacist bands led by Ian Stuart and Skrewdriver held "Rock Against Communism" concerts. The term eventually became used as a euphemism for racist Oi! music and later also hatecore punk and some other styles of hate music.
Those who use the term RAC often do so as a way to camouflage the true nature of the racist music, because the term does not make explicit the music's racist nature. Thus the acronym RAC is often used to describe hate music offered for sale on on-line auction sites, instead of more explicit labels that might cause site administrators to remove the item.