A Republican bill changing collective bargaining passed through the House and Senate on Thursday after a long and contentious debate. Governor Terry Branstad signed it into law on Friday. Collective bargaining began in 1974 requiring the state to negotiate items like wages, health insurance, vacation, seniority, safety rules, work conditions, and overtime with unions for state worker contracts. As of Friday, the revised law will limit bargaining to wages for most of Iowa's 180,000 public