In general, books on Sociology and related areas are given call numbers from HM-HX
HM Sociology (General)
HN Social history and conditions. Social problems. Social reform
HQ The family. Marriage. Women
HS Societies: secret, benevolent, etc.
HT Communities. Classes. Races
HV Social pathology. Social and public welfare. Criminology
HX Socialism. Communism. Anarchism
For a more detailed breakdown see: https://www.loc.gov/catdir/cpso/lcco/