Clearly these wouldn't correspond exactly to communautarisme, but in some contexts I think even these can work very well:
special interests
identity politics
Special interests is especially common U.S. political context; identity politics may be a tad dated but still relevant to so-called "culture wars."
special interests
identity politics
Special interests is especially common U.S. political context; identity politics may be a tad dated but still relevant to so-called "culture wars."