UPS Employees Say They Were Forced to Lobby Against FedEx - Washington Post In an increasingly bitter Washington battle between the nation's two largest shipping companies, some unionized UPS workers say they are being forced to write letters to their lawmakers in support of more stringent labor rules for arch rival FedEx. Officials with UPS and the International Brotherhood of Teamsters, which represents 240,000 UPS drivers, acknowledge that the company has paid for workers' time to pen many of the letters and has supplied the envelopes, paper and stamps needed to mail thousands of them to Congress. UPS spokesman Malcolm Berkley said the effort was "totally voluntary, and any allegations to the contrary are ridiculous." Now FedEx officials are bristling at the UPS letter-writing campaign, pointing to complaints from Scott and other UPS workers. "They are forcing us to write letters at our UPS center," one employee wrote on BrownCafe.com, a Web site independent of UPS. Another user wrote: "My System Manager told us 'this is not an optional activity.' I wrote the letters and still feel dirty."