Noun
(politics, historical, derogatory) propaganda term used by Mao Zedong against opponents
Used other than figuratively or idiomatically: see black, gang. (i.e. one with racially black members)
Source: en.wiktionary.orgFor her, this was a metaphor, he reminded himself. Though maybe he was a metaphor too, inside his head with the Black Gang. A metaphor gone metastatic. Lois McMaster Bujold