MIAMI—Newly filed lobbying records (pdf) show Venezuela’s socialist government previously hired a longtime Democratic Party donor for $6 million at the same time it was lobbying to discourage the U.S. from imposing sanctions on the oil-rich nation. The documents, which were disclosed Thursday, show a U.S. subsidiary of Venezuela’s state oil giant PDVSA agreed to hire Marcia Wiss’ Washington law firm in March 2017. That’s the same month it signed a consulting deal for $50 million with scandal-tainted former Congressman David Rivera. Wiss, an international trade lawyer with a history of donations to the Democratic Party, including a $1,500 contribution to Joe Biden last year, denies she did any lobbying work. Her former client—now under new management—said it was unaware of the full extent of her work to determine if it constituted political activities benefitting Nicolás Maduro’s government. The PDVSA subsidiary also took the unusual step of registering retroactively as …