You couldn't have setup a worse strawman. Congrats for making the jump straight from employee/employer relations to Nazis.

Governments throwing you in jail, intimidating you, or out right killing you all disrupt your right to free speech.

An employer exercising his free speech by firing you in no way prohibits your free speech. You can still tell everyone you want that you should form a union. No one is interfering to keep you from doing so.

Please tell me you don't actually equate those two scenarios.

consequences != interferences