[Gentile] landlords extorted Jewish refugees, demanding hefty fees in exchange for keys needed to access vacant flats. Still others fought with [gentile] occupants who refused to leave their dwellings despite [government] demands. Amidst the chaos, some ghetto dwellings housed ten to fifteen people. The dramatic increase in population density for Jews in the ghetto acted as a psychological assault intended to unsettle and disorient new ghetto residents.

(Source.)