Complain to the police and encourage others to do the same. The cyclists who are breaking the law should be ticketed, just as drivers who break the law should be ticketed.

These cyclists can't have it both ways: claiming to be traffic, then ignoring traffic laws.

Other than that, organizing other cyclists to picket the route when these yutzes are riding might at least let other people know that not everyone on a bike is a yutz.

(Sounds like a group of riders the mayor of DC would be very comfortable with.... )