Homeless (street) children - a social phenomenon in which there is separation of children from families with the loss of permanent home. Hallmarks of homelessness are: complete cessation of contact with family and parents; living in places that not intended for human habitation; providing for a life in ways which are not recognized in society (begging,
stealing); submission informal laws. The number of homeless children increased after the World War I and the Civil War in the USSR which was after the Great October Socialist Revolution. According to one source there were 4.5 million homeless children in 1921 in Russia, according to the others - in 1922 there were 7 million.