I think those are the Hit Wizards. Aurors are more like head hunters - only go after Dark Wizards while Hit Wizards go after the normal criminals. Or at least the lexicon says so (http://www.hp-lexicon.org/ministry/auror.html):
The Aurors are an elite group of witches and wizards who battle the Dark Arts. They operate in some ways as soldiers but more often as intelligence agents, seeking out Dark wizards and defeating them, often in fierce wizard duels. Alastor Moody and Frank and Alice Longbottom were famous Aurors. Aurors are sometimes refered to as Dark Wizard catchers. ... The Department of Magical Law Enforcement maintains squads of trained Hit Wizards whose job it is to capture dangerous wizarding criminals. A group of these Hit Wizards captured Sirius Black after he supposedly killed Peter Pettigrew. The Hit Wizards are not the same as Aurors. Hit Wizards, it would seem, are sent primarily against criminals while Aurors track down and capture Dark Wizards.
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I think those are the Hit Wizards. Aurors are more like head hunters - only go after Dark Wizards while Hit Wizards go after the normal criminals. Or at least the lexicon says so (http://www.hp-lexicon.org/ministry/auror.html):
The Aurors are an elite group of witches and wizards who battle the Dark Arts. They operate in some ways as soldiers but more often as intelligence agents, seeking out Dark wizards and defeating them, often in fierce wizard duels. Alastor Moody and Frank and Alice Longbottom were famous Aurors. Aurors are sometimes refered to as Dark Wizard catchers.
...
The Department of Magical Law Enforcement maintains squads of trained Hit Wizards whose job it is to capture dangerous wizarding criminals. A group of these Hit Wizards captured Sirius Black after he supposedly killed Peter Pettigrew. The Hit Wizards are not the same as Aurors. Hit Wizards, it would seem, are sent primarily against criminals while Aurors track down and capture Dark Wizards.