CARACAS, Venezuela — Venezuelan lawmakers on Thursday approved a bill that codifies economic sanctions, like those imposed by the United States, as crimes against humanity and allows the prosecution of anyone who expresses support for the measures. The bill, approved by the unicameral National Assembly, implicitly targets leading opposition leaders, many of whom have supported economic sanctions as a means to pressure the government into negotiations. The measure bans supporters of economic sanctions from running for office and allows authorities to prosecute them in absentia and seize their property. “The unilateral coercive measures and other restrictive or punitive measures adopted