There's a long history here. The American labor movement secured a lot of those protections in the early and mid-20th century, and they were strong for several decades. It was a hard, violent fight. People died at strikes for those protections.

As we entered the 80's and 90's with the rise of Reaganism and then neoliberalism, however, US businesses as well as the federal and state governments started chipping away at them. Now, between insufficient oversight, "right-to-work (spare me)" laws, lack of NLRB enforcement, and a robust cottage industry of private-sector union-busters, labor has less power in America than it's had in a long time.

It's good to see it start to change.