Staff at five household recycling centres in Sheffield are to strike this weekend over alleged job and pay cuts.
Members of the GMB union employed by social inclusion charity SOVA will stay away on 26, 27 and 28 May.
Sheffield City Council plans to shut some of the sites to the public on some weekdays to meet council budgets. The union says this will cause job losses and pay cuts.
The GMB insisted the facilities were being treated as a “cash cow” and that the public and staff were being short changed.
SOVA is sub-contracted by Veolia to run the five sites at Douglas Road, Blackstock, Beighton, Highgreen and Deepcar .
Sheffield City Council said it was committed to keeping two sites open this weekend.
Councillor Jack Scott said: “We have worked with the employers at the sites, SOVA Recycling, and with Veolia. I believe that SOVA has listened to the concerns of its employees.
“The basic problem is that Sheffield is facing massive government cuts. Of course, if there was an alternative to making this cut, we would take it. But the reality is that this is the consequence of such massive cuts.
“I’m pleased that we will be able to keep two of the five sites open and I’m very sorry for the inconvenience that this strike will cause.”