A group of extremists who have broken from the state, somtimes the military, to form there own paramilitary organisation. They use terrorism/guerilla warfare to fight for thier cause
I.R.A has lots of splinter groups, and there are lots of communist/marxist splinter groups as well.
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A group of stag party participants who sneakily break away from the main group because they're too boring
This pub is shit, let form a splinter group and go to that lap dancing club around the corner