President Obama has been arguably the most pro-labor chief executive since Harry Truman. He has appointed staunch labor allies to the federal agencies that watch unions, and he has tilted the regulatory field in organized labor’s favor through reintepreting old rules and implementing new ones.

“I am proud and humbled to be your humble servant as labor secretary,” Obama’s first labor secretary, Hilda Solis, told the AFL-CIO labor federation at its 2009 convention in Pittsburgh.