What legal weapon was issued almost automatically by the courts on request of government officials or corporations against union organizing?

I believe the answer is: Injunction

In legal terms, injunction refers to a form of threat that given by one party to another which dictate one party to conform to a certain condition if they want to avoid being sued by the other. Corporations often used this to their employees that they deemed as 'problematic' in order to shut them down.

Ais the correct answer