The charity Shelter, which this week produced another report suggesting how landlords should better manage their tenants, is facing a three day strike next week because its own management is allegedly cutting the pay of front-line staff.
The union Unite says its 400 members at Shelter have voted for a three day walk out begining on Tuesday morning.
Unite claims that the charity - which employs 1,300 people in a range of support, research, retail and management roles - was making changes that could lead to pay cuts of up to £5,000 a year for new advice and support workers and £3,000 for existing front-line staff.
Unite also says the pay of existing front-line staff was being guaranteed only until 2016.
The union says that 69 per cent of its Shelter membership, which has grown to 400 in recent weeks as the industrial dispute has escalated, vote for strike action.
"Our members care deeply about the help they give and the people they support. They are fearful that cut-rate pay will lead to a cut-rate organisation as managers struggle to recruit experienced replacements on the new lower rates of pay says a spokesman for the union.
"Shelter's front-line support and advice workers are the lifeblood of the charity and deserve better than pay cuts while those with huge salaries at the top see their pay protected.
In recent months the thrust of Shelter's activities appear to have changed from championing the cause of the homeless, and campaigning against homelessness, to aggressively criticising landlords and in some cases letting agents in the private sector.