As we all know, contractors face the potential for overlapping jurisdictional claims between two or more unions. MARBA has issued a memorandum on the procedures, should a jurisdictional issue arise. The full memorandum may be read here.As we all know, contractors face the potential for overlapping jurisdictional claims between two or more unions. MARBA has issued a memorandum on the procedures, should a jurisdictional issue arise. The full memorandum may be read here.