Union leaders and labor rights advocates applauded the Democrat-controlled U.S. House for passing landmark legislation Thursday night that supporters have called one of the most notable efforts to expand workers' rights in several decades.

The Republican-controlled National Labor Relations Board (NLRB) ended 2019 by rolling back another round of Obama-era regulations and handing down a number of pro-employer decisions. One of those rulings restricts workers from wearing union buttons and other pro-labor insignia.

In the 1930s, at the time of the writing of the Wagner Act—the law which grants workers the right to form unions and collectively bargain— union organizing took place during shift changes on factory floors and over beers in union halls.