What effect did the Taft$-$Hartley Act of $1947$ have on the U$.$S workforce?

The Act

forbade the hiring of undocumented immigrants and required proof of citizenship as part of employment. gave workers the right to have $60-$days notice for plant closings or large layoffs if the firm had more than $100$ employees.

gave states the power to let workers decide whether or not they wanted to join a union if the workplace already $h$ a union.

set up the National Labor Relations Board for settling disputes between the union and management.