Respuesta :
The tactic that Pinkertons use to bust unions is union banning in the workplace and forcing them to sign contracts to not join unions.
What do you mean by union-busting?
The act was done by the employers for keeping unions from forming is known as union-busting.
The Pinkertons used various tactics to bust unions by firing workers to join the union, blacklisted organizers, and forcing employees to not join unions.
Therefore, A is the correct option.
Learn more about Union busting here:
https://brainly.com/question/11572387
