Thousands of Rotherham council workers in South Yorkshire could strike in response to the council imposing a single status pay deal.
The workers are angry that council bosses bypassed the unions and wrote directly to them demanding they agree to changes to their contracts.
The imposed deal will mean cuts in weekend payments and the scrapping of unsocial hours payments for many of the lowest paid workers in the council.
The Unison union is set to ballot its 5,000 members working for the council on industrial action. A consultative ballot has already shown the overwhelming majority in favour.
The workers were planning a mass protest against the deal at a council meeting this week.
Carol Maleham, Unison branch vice president, said, “The council gave staff two weeks to decide whether to agree to these changes.
“We anticipate that the council will now terminate the contracts of those who have not accepted in order to impose the new pay and conditions.
“In a show of solidarity with these low paid workers our members from all grades have indicated they are prepared to take industrial action.”