It depends on the shop and the jurisdiction, but for the most part, if the company is big enough and the union is strong enough, a foreman/middle-manager (who is often former union) is best off keeping his/her nose clean. The union only needs to blink towards headquarters for Damocles' blade to fall upon the poor sap who reported the fatty/fatty-minded. ...things have largely changed over the past 30 years, but this still exists in many large shops and, especially, municipal/regional governments.