"Gang hideouts" refers to secret locations or places where gang members gather or hide to carry out illegal activities or hide from law enforcement. Full definition
Solomon's Folly single player gang hideout and challenges available for the first time on the XBox 360 (totallygn.com)
Gone are the mini games, most of the population and any random missions, the train is absent, there aren't interesting adversarial free play (like kidnap missions then again there isn't even the lasso for that matter) and outside of a few gang hideouts there's nothing that requires a collaborate effort. (metacritic.com)
Red Dead Redemption 2 will feature a dynamic gang hideout camp which changes location as you progress in the game and needs to be maintained. (rdr2.com)