Columbia subject headings:
Harvard subject headings:
Lynching--History--20th century.
Mobs--History--20th century.
Organized crime--History--20th century.
Political violence--History--20th century.
Violence--History--20th century.
War crimes--History--20th century
Princeton subject headings:
Lynching--History--20th century.
Mobs--History--20th century.
Organized crime--History--20th century.
Political violence--History--20th century.
Violence--History--20th century.
War crimes--History--20th century.