CIRCO seem to be an offshoot (or rebrand) of CIRCA, the Clandestine Insurgent Rebel Clown Army i.e. these clowns;
Seemed to be all over the place during the anti-war and G8 demos a while back. They're basically a bunch of rich kid wannabees. They'll grow up in a few years time and will no doubt end up working for daddy's law firm.