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In the years 1953 to 1955 the Department of Criminology of the Institute of Legal Sciences carried out research on gangs of juvenile delinquents; it was a matter of the offences committed by three or more boys aged up to 17 who formed gangs of offenders. At the Warsaw Juvenile Court the records of 716 juveniles who had, during the period in question; participated in 181 crime-committing gangs, have...