Usury is the practice of making loans that are seen as unfairly enriching the lender. The term may be used in a moral sense—condemning taking advantage of others' misfortunes—or in a legal sense, where an interest rate is charged in excess of the maximum rate that is allowed by law. A loan may be considered usurious because of excessive or abusive interest rates or other factors defined by the laws of a state. Someone who practices usury can be called a usurer, but in modern colloquial English may be called a loan shark.
Of Usury, from Brant's Stultifera Navis (Ship of Fools), 1494; woodcut attributed to Albrecht Dürer
Christ Drives the Usurers Out of the Temple, a woodcut by Lucas Cranach the Elder in Passionary of Christ and Antichrist
St. Bernardino of Siena, treatise on contracts and usury (Tractatus de contractis et usuris), manuscript, 15th century
Magna Carta commands, "If any one has taken anything, whether much or little, by way of loan from Jews, and if he dies before that debt is paid, the debt shall not carry usury so long as the heir is under age, from whomsoever he may hold. And if that debt falls into our hands, we will take only the principal contained in the note."
A loan shark is a person who offers loans at extremely high or illegal interest rates, has strict terms of collection, and generally operates outside the law, often using the threat of violence or other illegal, aggressive, and extortionate actions when seeking to enforce the satisfaction of the debt. As a consistent or repeated illegal business operation or "racket", loansharking is generally associated with organized crime and certain criminal organizations.
Lift door sticker awareness campaign in Singapore
Ah Long pamphlet found in a car door handle in Malaysia