The Keep of the Rawhide Gang

From publisher blurb: Hex 15.42 in the Populated Hexes series features a brigand keep in the hills to the south of a trade road. It includes a fully fleshed out brigand gang, an alternate brigand character class for use in your Old School Essentials or similar OSR-style game, and expanded rules for adding Brigandry to the thieves' guild options presented in A Guide to Thieves' Guilds.