Members of the Public and Commercial Services union (PCS) in Merseyside struck for three hours on Monday 5 March.
The strike was part of an attempt to stop the transfer of 100 workers from local job centres to centralised call centres.
29 job centres and two existing call centres were affected by the action.
Carillion workers launch more strikes
Carillion workers at Great Western Hospital in Swindon will take a further five days of strike action from 8 March, followed by another 7 days from 17 March.
The strikes involve porters and auxiliary workers working on a PFI contract.
They are part of a long-running dispute against bullying and harassment by Carillion bosses.
Huge vote to reject council pay cuts
Workers at Aberdeen Council have voted overwhelmingly, on an unprecedented turnout, to reject the council’s latest pay offer, which would have amounted to a 30% cut in wages.
Members of the GMB union voted by 93% on an 80% turnout to reject the deal.
The union will now discuss how to proceed following the ballot.