Were there homeless people in the USSR?

My SO and I were watching "The Americans" and discussing communism and the USSR. She was asking about their social programs and if there were homeless people in the USSR. To clarify, perpetually homeless people – were there any? If so, what did they (the gov) do with them? What allowances for homeless people? Rehabilitation?

As a follow up, what books/resources would you recommend on the USSR era? Specifically on regular life and society. Documentaries, films, whatever! Thanks in advance.