A robber baron or robber knight was an unscrupulous feudal landowner who, protected by his fief's legal status, imposed high taxes and tolls out of keeping with the norm without authorization by some higher authority. Some resorted to actual banditry. The German term for robber barons, Raubritter, was coined by Friedrich Bottschalk in 1810.

Banditry is a type of organized crime committed by outlaws typically involving the threat or use of violence. A person who engages in banditry is known as a bandit and primarily commits crimes such as extortion, robbery, and murder, either as an individual or in groups. Banditry is a vague concept of criminality and in modern usage can be synonymous for gangsterism, brigandage, marauding, terrorism, piracy and thievery.