A Liquidator is a feared position within the Ferengi Alliance as they are agents of the Ferengi Commerce Authority. They are answerable to the Board of Liquidators who are part of that Authority, itself headed by the Chief Liquidator.
This fear originates because of the potential loss in profifts of any Ferengi who angers these officers as they are empowered to instil bans on those Ferengi who break a contract with another of their kind. This can effectively stop the people from dealing with the banned individual and their business. This in turn produces a massive loss in profit as well as a lack of opportunities.
This creates a dangerous atmosphere for these Ferengi as their profit driven society prevents them from continuing their way of life and even denies them a place in the afterlife under Ferengi beliefs. This earns the Liquidators the quiet dislike of all other Ferengi. (DS9 episodes: "The Magnificent Ferengi" and "Profit and Lace").