Protesters called on councillors to help stop cuts in the NHS and help them get justice for a man in Guantanamo Bay.
Groups of campaigners rallied outside a Brighton and Hove City Council meeting at Hove Town Hall on Thursday night.
About 20 members of Keep NHS Public Brighton lobbied councillors and the public going into the meeting.
Paul Evans, of the NHS Support Foundation based at Community Base, Queen's Road, Brighton, said: "We are trying to raise public awareness about what is happening. Councillors have got a very strong role in helping to protect local health services."
A psychiatric nurse from Brighton, who asked not to be named, said: "We want to make people aware how these changes are coming in. I don't think the public knows what's going on."
There were five supporters of the Save Omar Campaign, which is fighting for justice for Guantanamo Bay prisoner and former Saltdean resident Omar Deghayes.
Supporter Manus McGrogan said: "It is getting to a critical point. They may close Guantanamo and Omar might be sent back to Libya where his life is in danger."
Councillor Francis Tonks presented the council with a 350-signature petition asking it to support Omar's case. To applause, he read out an editorial from The Argus calling for the council to "put its money where its mouth is".
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