Know Your Rights!
YOU have the right to representation.
If you are ever called into a meeting with your supervisor or by management YOU have the right to know the purpose and subject of the meeting.
If you have reason to believe that the meeting could lead to any kind of discipline YOU have the right to representation.
YOU must ask for that right.
Your supervisor or management DOES NO HAVE TO offer it to you.
It is YOUR RIGHT to consult with your union representative before the meeting.
If you ever have any doubt please see your steward.