So if me and my 2 other buddies are the only two employees at an early startup we can unionize and demand immense equity packages, and the company is prohibited from hiring additional employees if they don't like our demands?
This does not sound right - this effectively gives unions the ability to extort companies with impunity. I'll believe this claim that companies are prohibited by law from hiring a non-union workforce if you back it up with a source.
Again, they don't have to accept your demands, but they do have to negotiate rather than just telling you to buzz off. It's illegal for a business to "refuse to bargain collectively with the representatives of its employees". Many people do argue that this gives unions the ability to extort companies with impunity - it's one of the main reasons companies often fight so hard against having a union form.
(If you literally only have 2 employees, the employer might not meet the threshold to be covered under the NLRB.)
> It's illegal for a business to "refuse to bargain collectively with the representatives of its employees".
Right, it's illegal for a company to say "we're not going to bargain with you collectively, at all" but it's not illegal to decline the bargain that employees offer. The company at least has to sit at the table and consider their option - it does not prohibit companies from listening to the collective bargain and declining to accept it.
We may be saying the same thing from different angles. You have the right to decline the employees' proposal, but you have to try to negotiate something better, not just boot them out immediately.