Interesting point that the American Constitution contain laws the government should follow, but no specified punishment if they didnt not follow them.
Though to address your point of and anarthist system containing tyrants, gangs and warlords. Is an oxymorron I would say. As anarchy does not mean without rules, and for it to have any way to function, it would need rules to prevent it being taken over by archons. Meaning the moment any tyrant , warlord or gang leader emerges, that would then be against the rules set in place to keep it an anarchist system.

So if what you referred to was to happen, that when in that instant change it into not an anarchist system.

There is villages being established that is anarchist today, to work out ways it can work; like Liberland and Liberstad. And there is a town in Mexico that kicked the government out to organize itself and thus in essence is anarchist. where Luke from WeAreChange and Jeff from TheDollarVigilante went to see how it worked. And Luke is working on putting together a small documentary about it.