There were some Anarchist pockets in Spain during the Spanish Civil War.
From what I remember, they did the following:
-Replace money with coupons
-Fight a really disorganised war (get on truck, drive to front, take pot-shots at Fascists, drive back, have dinner, recite revolutionary poetry, make love to girlfriend, go to bed, repeat until shot by Fascist).
-Fail to capitalise on initial military success, because we don't want hierarchy and therefore can't appoint negotiators, nor decide points to negotiate.
-Set fire to a couple of churches.
That's it, I think. It lasted too short to see how this would work for real in peacetime.
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