The term was coined by Norwegian sociologist Johan Galtung, who introduced it in his 1969 article "Violence, Peace, and Peace Research". Some examples of structural violence as proposed by Galtung include institutionalized racism, sexism, and classism, among others. Structural violence and direct violence are said to be highly interdependent, including family violence, gender violence, hate crimes, racial violence, police violence, state violence, terrorism, and war. It is very closely linked to social injustice insofar as it affects people differently in various social structures.