WASHINGTON — Labor unions, domestic manufacturers, business associations and other interest organizations on Wednesday announced a bipartisan coalition to target an import loophole allowing billions of un-taxed goods into the U.S. "The coalition we have assembled is a testament to the mounting pressure to close the de minimis loophole," Rep. Earl Blumenauer, D-Ore., said. The ranking member of the House Ways and Means Subcommittee on Trade is working in conjunction with the new Coalition to Close the De Minimis Loophole. The group will call attention to a so-called "de minimis" provision of Section 321 of the Tariff Act of 1930, which waives import tariffs for s