Star Wars: Rise of the Empire
Tatooine was until very recently a part of Hutt Space, effectively ruled by the Hutt clans. With the rise of the Empire, however an Imperial governor and garrison have been installed at Bestine township. The governor is largely concerned with preventing sedition and helping secure the Imperial spaceport, which is under the jurisdiction of Red Tails command, having a mostly hands off attitude to governing the rest of the planet. So the Hutts, in particular Jabba have retained much of their influence. While Bestine is the seat of the Imperial governor, Mos Eisley is the location of the local starport and was formerly the de facto capitol city.