Okay, let me see if I have it all straight now:

Aurors=the best of the best, the cream of the crop, dark wizard catchers (why it's so hard to become one)
Hit Wizards=one step below Aurors, deal with wizards who commit crimes, crimes against Muggles, crimes reported to law enforcement (if so, this would definantly be my guy)
Enforcers=regular patrol wizards to enforce law in the wizarding community, something akin to a cop who rides around neighborhoods in a cop car


Wonderful! Now I understand.