Alternate timeline
(covers information from an alternate timeline)
Corruption was a crime.
In an alternate timeline where USS Voyager returned from the Delta Quadrant later, a Ferengi faced corruption charges, according to a news broadcast. (VOY: "Endgame")
Despite its status as the traditional host of the annual Starfleet Command Conference and its corresponding afterparty, the civilian security force onboard Starbase 25 was said to have a reputation for significant corruption, abusing its power to secure confessions through coercive measures and confiscate combadges to sell on the black market. Beckett Mariner was familiar with the existence of these crooked lawmen from her time aboard the starbase. (LD: "An Embarrassment Of Dooplers")