Elon Musk is not a fan of unions. Nor are Amazon, Starbucks, or, apparently, Trader Joe’s. Those four companies opened the new year by mounting a legal campaign to destroy the federal agency charged with protecting workers from unfair anti-unionization efforts and maintaining labor peace. If they succeed, they could radically tip the scales in favor of corporations and away from the workers who hope to organize their workplaces.SpaceX, the rocket company founded by Musk, asked a federal judge la