The four unions representing Akron employees are “shocked and dismayed” at a city proposal to have retirees start paying toward their supplemental health insurance and end that benefit for all future workers.The unions also are threatening to sue if the city pursues the plan.“Our retirees have earned, at the very least are owed, an acceptable benefit plan that has been agreed upon and signed by the city without unfair, unrecognized … modifications that are a clear violation of all four union’s collective bargaining agreements recently signed by the city,” the unions wrote in a joint two-page statement released this week.The unions are: the Civil Service Personnel Association; American Federation of State, County and Municipal Employees Local 1360 and AFSCME Ohio Council 8; International Association of Fire Fighters Local 330; and Fraternal Order of Police Lodge 7.The unions also accused the city last year of engaging in “bad faith negotiations by secretly forming a select group of people tasked with formulating legislation to reform retiree healthcare, circumventing the negotiating process as defined by Ohio state law.”The city and its unions agreed to new three-year contracts earlier this year that included raises and concessions on paying toward health insurance.The city administration disagreed that the proposed changes for retirees would violate the contracts.“While the administration respects the role of unions, in accordance with state law this is not a negotiable issue,” the mayor’s Chief of Staff James Hardy said in a prepared statement.