The United Steelworkers, representing more than 30,000 U.S. oil workers, instructed members to reject a seventh labor contract offered by Royal Dutch Shell Plc as the biggest refinery strike since 1980 dragged on. The proposal, the first one made by Shell since Feb. 5 on behalf of companies including Chevron Corp. and Exxon Mobil Corp., “fails to improve safety” in an enforceable way, the USW said in a text message, instructing local units to prepare to join the strike “if called upon.” Ray Fisher, a spokesman for The Hague, Netherlands-based Shell, said the company had no comment beyond saying the two sides met. Since Feb. 1 more than 5,000 USW workers have walked out of a chemical plant, a cogeneration complex and […]