This is my spin of an idea posted by Ozzy.

The basic idea:
Have an alignment tag: (Cop), (Gangster). Also, there should be some content that has the two tags battling.

My spin:
There should be a cop base (Southridge police department or expand on the northern building) and a gangster base (the random base sized building at the most north point of map). You must have your alignment tag on to attack the flag/safe and be immune to attacks by others of your alignment. People with regular gang tags cannot take the flag.

To keep it interesting, there should be a point to alignment basing. Maybe if you get a personal total of hours you get achievements, a payout for personal hour time and themed hats.

About the tags, there shouldn't be a member maximum, since everyone has an alignment. Another thing, alignment tags cannot take regular bases.  

What about neutral people?  

Neutrals would be able to kill both tags in bases, but can't take the flag. They have to pk until their alignment changes.

Also, your alignment tag would update automatically, so you'd be cop, gangster or neutral, under one tag with three names. So, your tag would let you know when you gain cop or gangster.  

I was thinking Cops get 9% more defense and gangsters get 9% more damage, neutral would have less freeze?
But I still see something wrong in implementing it, so never mind.  

Good idea. The gangsters vs. cop theme needs to be influenced more in-game.