YES, YOU HAVE RIGHTS!
The U.S. 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. These are called Weingarten Rights. NLRB v. J Weingarten, Inc., 420 U.S.. 251, 88 LRRM 2689 (U.S.. Sup. Ct. Request for Union Representation.pdf