What is the name of your state (only U.S. law)? Illinois - I work for a Construction company. The field crews are union and the office is non-union. Through the years, some of the crew members were promoted into the office and withdrew from the union. The owner now wants to put these office workers back into the union so they can get more paid into their pension plan. Their job description has not changed. The rest of us are not being offered any kind of alternative benefit. Is this legal? Doesn't the owner have to offer Equal benefits to all in the office?