Illinois is about to become the latest state to bar employers from pressuring workers with anti-union talk. But legal challenges lie ahead for these laws.

That would add Illinois to a list that already includes Connecticut, Maine, Minnesota, New York, Oregon, New Jersey and Washington.

Meanwhile, at least another 10 states are considering passing similar legislation, potentially covering more than 60 million workers around the country, according to the Economic Policy Institute, a left-leaning think tank.

Like in other states, the Illinois measure, called the “Worker Freedom of Speech Act,” goes beyond the subject of collective bargaining, forbidding employers from holding mandatory meetings on “religious or political matters.” That means employers could not force a worker to attend a meeting where the company promoted a political candidate or particular religious views.