Vory <-> Gang <-> Mafia
Vor <-> gang leader <-> Don
Bojevik <-> gang lieutenant <-> high ranking member
Thug <-> ganger <-> Mob Enforcer
What she meant (and I failed to translate into english) is that opposite to Denver gangs. Vor (russian syndicate leader) isn't on friendly terms with his subordinates (bojeviks) he just gives them order, and cut their balls if they fail to do what he asked them. Gangs are more like family, where gang leader act more like a father.