Interesting. I think the risk you run when doing something like this is that you end up like the Cultural Revolution or the Khmer Rouge. To hold power you need a constantly moving target, and the underlings quickly learn that they just need to point out the marks lest someone point them out. I guess maybe El Salvador is an exception insofar as the tattoos seem to mark the gang members pretty easily, but that's a problem that will solve itself in 5 years as the new gang members adapt. Hard to give up power once it's taken, but on the other hand, the situation there was clearly unsustainable.