The United States Supreme Court has ruled that the National Labor Relations Act gives workers the right to request union representation during investigatory interviews by supervisors, security personnel, and other managerial staff.
You have a right to representation at any time management discusses disciplinary action with you. Always state the following:
“If this discussion could in any way lead to my being disciplined or terminated, or affect my working conditions, I respectfully request that my Union representative, officer, or steward be present at this meeting. Without representation, I choose not to answer any questions.”