@ossobuco,
You should be able to find info on this group - they came last year to NYC and the police were trying to keep them from organizing there. From what I heard - they are stunt drivers at least that is their claim.
another interesting tidbit. The unfortunate motorcyclists that was injured the most actually does not have a drivers liscence much less a liscence to operate a motorcycle.
Though Mieses is a Massachusetts resident, he has never had a valid Massachusetts driver’s license for a passenger vehicle and has never applied for a motorcycle license, the Registry of Motor Vehicles said.
Registry records show that Mieses applied for a learner’s permit in 1999 and 2000, but that he never obtained a full license because he failed to pay fines imposed after he was ticketed for speeding in Lawrence in 1999.
His last contact with the Registry was in 2001, when he obtained an identification card, registry records show.
Since 1999, he has been ticketed by police 16 times, in Lawrence, Methuen, Roxbury, Andover, and New Hampshire, according to registry records.
In June, the Registry notified the National Driver Register that Mieses was a habitual traffic offender whose right to drive in Massachusetts was revoked until 2017, records show.
http://www.bostonglobe.com/metro/2013/10/01/lawrence-man-seriously-injured-nyc-incident-involving-suv-and-motorcyclists/jHju3V1xAOsdF6Q2vT8BaL/story.html