"Members who join the Enforcement United beta will participate by providing their opinions on whether particular content, initially Gamertags, violate the Xbox Live Code of Conduct," Microsoft writes. "These decisions from participants feed into an algorithm our team developed. That algorithm takes several factors into account like how many participants believe there had been a violation and how reliably those individual members' historical decisions aligned with the general consensus."
The system then decides whether the violator in question needs to change his Gamertag, or if it should go to an official Microsoft enforcer for review. Enforcement United launches alongside the new Xbox Community Level, which rewards players for participating in services such as Xbox Live Ambassadors and Enforcement United.
This is a different step than the proposed reputation system for Xbox One, which pits troublesome players with troublesome players in a separate matchmaking layer online.
Those who want to join Enforcement United can do so here.