"Pick the slogan Caterpillar Inc. has banned as 8,700 members of the United Auto Workers union return to their factory jobs after their bitter 17-month strike:</br></br>1. ""Families in Solidarity, UAW.""</br></br>2. ""Solidarity Forever.""</br></br>3. ""Proud to be Union.""</br></br>Under Cat's strict new standards of conduct, slogan No. 1 is out of bounds. Nos. 2 and 3 are allowed, the company says."