The ongoing vote follows a decision earlier this year when the union rejected King Soopers' offer to add new staff to 20 stores and continue investing in workers’ pensions. The company also proposed a $0.25 raise for all employees, which the union turned down.

The union workers of Kroger-owned King Soopers grocery stores in the metro Denver, Boulder, Parker and Broomfield bargaining units voted to go on strike, the union announced