A Michigan union fired back at workers who dropped off the membership rolls by urging its members to isolate them at work. Jeff Hagler, president at UAW Local 412 in Warren, Mich., sent out a newsletter to about 3,000 autoworkers who belong to the union in December. The letter includes a list of 43 mostly female workers who opted out of membership, as well as advice on how they should be treated in the workplace. "They have elected to quit paying union dues, but are still benefitting by continued representation by the union. Whether we feel this is fair or...