[SwedishExpat]

Sweden has a small government approach to labour, the idea is that Unions are more agile and closer to the market so they are given the power to negotiate. The legislation is basically "there are no laws, speak to the Unions and sign the agreement". So yes you're correct they aren't breaking any laws, but neither are the Unions for not working for companies without a collective bargaining agreement.

This system has worked well for a hundred years with Sweden ranking highly across most metrics for work satisfaction, happiness, etc... however every now and then an American company comes over and tries to challenge it. These companies get sympathy striked into the ground, sign a collective agreement, and live happily ever after.