Source: Courtesy Photo of U.S. Customs and Border ProtectionIt is rare in this polarized era for legislation of moral and commercial significance to attract substantial support across party lines. A bill to fight slave labor in China is turning out to be a notable exception.The Uighur Forced Labor Prevention Act, was introduced in March by Representative Jim McGovern, the Worcester Democrat who chairs the House Rules Committee, and by Republican Senator Marco Rubio of Florida. It would ban the importation of goods made in China's Xinjiang region, where more than 1.5 million Uighur Muslims are imprisoned in a vast gulag...