Former President Joe Biden’s massive expansion of the federal workforce and flurry of administrative moves on his way out the door have already created roadblocks for President Donald Trump as he seeks to deliver on the sweeping reforms he promised. From greenlighting new union protections for federal workers to approving last-minute energy rules, Biden administration officials spent the weeks after Trump’s election making moves to complicate the incoming president’s agenda. Some of those efforts began months before the votes were cast, and others took place in the 76 days between Biden’s defeat and Trump’s inauguration. And while most outgoing administrations...