If you are called to a meeting with management that you suspect will be disciplinary in nature, you have the right to request union representation under the U. S. Supreme Court ruling, Weingarten Rights (NLRB v. Weingarten.).
If in a meeting with management you are questioned to obtain information and you have reasonable apprehension that your answers could be used as a basis for discipline or other adverse action, it is your responsibility to ask to reschedule the meeting or resume when your union representative is present. If you choose to remain, you may refuse to answer.
If you are in a