Full title: BREAKING: Bernie Sanders just introduced the Guaranteed Paid Vacation Act — a bill to guarantee at least two weeks of paid vacation to every full-time worker in America. Over 90 other members of Congress have already signed on to the legislation.
https://en.wikipedia.org/wiki/Taft%E2%80%93Hartley_Act
https://en.wikipedia.org/wiki/Right-to-work_law
And of course businesses regularly lobbying against unions as well as any form of regulation they can along with media outlets controlled by the ultra wealthy serving as their propaganda outlets against unions, among other things.