(i) The vast mass of one room houses occupied by the poor were seen as a serious threat to public health. (ii) Cities were overcrowded, badly ventilated, and lacked sanitation. (iii) There were worries about fire hazards created by poor housing. (iv) There was a widespread fear of social disorder, especially after the Russian Revolution in 1917. (v) Worker's mass housing schemes were planned to prevent the London’s poor from turning rebellious.