Workers at Barnet council in north London were set to strike for 24 hours on Wednesday of this week.
They are striking during the Tory party conference to highlight the danger of outsourcing local government services.
The Unison union members’ walkout is against another wave of privatisation at the Tory-run council.
The council has already outsourced hundreds of Barnet workers.
This has often led to redundancy as jobs are moved as far afield as Darlington, Carlisle, Southampton, Coventry and Belfast.
Barnet council’s latest plans could see children’s centres, libraries and social work farmed out.
The walkout next week will include occupational therapists, refuse workers, social workers, children’s centre, catering and library staff.
Shadow chancellor John McDonnell gave the strikers his backing. He said, “I am fully behind Barnet Unison members taking strike action on 7 October.
“If possible I hope to join you on the picket line.”
The union is also supporting a lobby of the council on 12 October called by Save Barnet Libraries against the privatisation plans.
Donate to Barnet Unison Industrial Action Fund, Building 4, North London Business Park, Oakleigh Road South, London N11 1NP