Striking workers at Eck Industries Inc. in Manitowoc returned to work May 8, less than a week after walking off the job May 2. The workers are members of the Glass, Molders, Pottery, Plastics and Allied Workers International Union Local 301, which said in a post on its website May 3 that it was "protesting the anti-union language in the company's contract proposal that they have found to be unacceptable." The chief executive of Eck Industries, a premium aluminum castings company with more than...