Cloward and Ohlin expanded on strain theories by proposing three deviant subcultures that form based on unequal access to legitimate and illegitimate opportunity structures. Criminal subcultures provide apprenticeships in crime. Conflict subcultures lack access to both structures and engage in gang violence. Retreatist subcultures fail at both and focus on drug abuse. They argue people enter different subcultures depending on their access to illegitimate opportunities rather than just strain alone.