Stewartry Council of Voluntary Service is facing the axe.
The Kirkcudbright-based organisation is set to be swallowed up in an umbrella group representing the whole of Dumfries and Galloway.
And that has sparked fears that the voice of SCVS and five similar groups will be lost.
Under government proposals they would become the Dumfries and Galloway Third Sector Interface (DGTSI).
But volunteer group representatives are appalled at the plan which they see as a dilution of services.
Marie Jackson, manager of SCVS, said: We are being railroaded down a road we dont want to go down and basically they want to make us one organisation.
There would no longer be Stewartry Council of Voluntary Service, Nithsdale Council of Voluntary Service or any of the other organisations.
She added: They say we would still be able to serve the local area but if in six months they bring in a new CEO (chief executive officer) - which is what they are proposing - what is the first thing a new boss does? They sweep it clean.
When there is centralisation there is almost always loss of service people in the third sector will lose access and people in the Stewartry will lose their voice.
The six organisations targeted by the plan are Annandale and Eskdale, Nithsdale and Stewartry CVS, The Bridge (formerly Wigtown CVS), Volunteer Action DG and the Local Social Economy Partnership.
They currently operate within DGTSI which receives £376,000 a year in funding from the Scottish Government. But the existing set-up was deemed not fit for purpose after an independent review. And the government is now looking at creating one single organisation representing the voluntary sector across the region.
Holyrood officials are due to meet representatives of SCVS and their Nithsdale counterparts at DG One in Dumfries on Monday to discuss the proposal.
Nithsdale CVS chairman Andy Todman said: We fully support and wish to contribute to an effective third sector interface for Dumfries and Galloway and have invested considerable effort and resources into its development. However the current proposed change bears no resemblance to the model originally consulted on.
This proposal does not evidence that it will save money or improve the level of services we currently deliver.
Dee ward councillor Jane Maitland is also concerned. She said: Any attempt to centralise services I view with deep suspicion.
As it stands SCVS provides a good service offering advice to local groups.
A Holyrood spokeswoman said: The Scottish Government is committed to ensuring that the third sector is fully involved in the design and delivery of local services.
D&G Third Sector Interface receives the second highest share of interface funding in Scotland but a recent independent assessment confirmed that the current arrangements are not fit for purpose. The Scottish Government is working to agree a joint solution.