Subject
Mass murder
History
17
Genocide
10
Mass murderers
8
Atrocities
7
Politics and government
7
State-sponsored terrorism
7
Crimes against
6
School shootings
5
Violent crimes
5
Firearms and crime
4
Holocaust, Jewish (1939-1945)
4
Massacres
4
Murderers
4
Political persecution
4
Psychology
4
Students
4
Violence against
4
Antislavery movements
3
Campus violence
3
Firearms
3
Law and legislation
3
Marine insurance
3
Mass shootings
3
Political violence
3
Psychological aspects
3
Seafaring life
3
Serial murders
3
Slave trade
3
Slavery
3
Trials
3
World War, 1939-1945
3
Alchemists
2
Antisocial personality disorders
2
Criminal psychology
2
Disappeared persons
2
Francoism
2
Gun control
2
Homicide
2
Human rights
2
International law
2
Kidnapping
2
Life imprisonment
2
Magic
2
Mentally ill
2
Murder
2
Murder in mass media
2
Physicians
2
Police murders
2
Political purges
2
more ...