A type of legal action similar, but much broader, than an injunction or writ of mandamus in U.S. courts. Asks the court to review the constitutionality/legality of a government action and force the government to act according to the law. Used by many debtors to obtain their dollars from banks, by challenging the Corralón, Corralito and forced conversion of dollar-denominated accounts into peso-denominated accounts as a violation of their contract and/or property rights.