Adam Jaskowiak was one of the men targeted and said he pleaded with police to be able to keep his things but was ignored.
He was sleeping with eight other people finding shelter for the night in the former Ilford Baths in High Road, Ilford.
All of their belongings were bundled into a police car leaving the men, one in his 60s, stunned.
A police chief told the Recorder the operation was carried out to “reduce the negative impact of rough sleepers”.
But Mr Jaskowiak, 34, said: “They were just taking the sleeping bags and chucking out everything. I asked to keep it and the food, but they said ‘no’.
Let it be known that the state will not tolerate anybody who provides food to those that are hungry or seeks warmth in a sleeping bag when the have no shelter. One thing is for certain, the state will take whatever you have even if you have nothing more than a little food and a sleeping bag.