Bin workers in Birmingham will take fresh strike action, a union said.
On Friday, the Unite announced it would escalate the action after failing to receive a satisfactory response from Birmingham City Council.
It said its members would now stage walkouts for two days a week from later this month.
Last month, the authority approved a move to seek the injunction against the union if it refused a formal offer to resolve the dispute through the Advisory, Conciliation and Arbitration Service (Acas).
The council and GMB previously said the payment was made to GMB members because the union was not consulted during the talks that ended the 2017 strike.
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