Indian Penal Code, 1860
347. Wrongful confinement to extort property, or constrain to illegal act
Whoever wrongfully confines any person for the purpose of extorting from the person confined, or from any person interested in the person confined, any property or valuable security or of constraining the person confined or any person interested in such person to do anything. illegal or to give any information which may facilitate the commission of an offence, shall be punished with imprisonment of either description for a term which may extend to three years, and shall also be liable to fine.