The USW moved to block a Kaiser Steel action.

The United Steelworkers of America filed court documents urging a bankruptcy judge to keep Kaiser Steel Corp. from terminating two pension plans covering 7,300 retired Fontana workers. In papers filed in federal bankruptcy court in Denver by UAW District 39, the union said termination of the pension plans would immediately cause about 1,300 retirees to lose about $400 each in monthly supplemental benefits. The union has asked the Denver court for a hearing on its concerns before a ruling is to be issued July 28. Kaiser Steel, now based in Colorado Springs, Colo., sought Chapter 11 bankruptcy protection from creditors in February.