Now we know who's in charge of Minneapolis streets. It's a loosely organized group of serial lawbreakers called Critical Mass. Last Friday, 600 or so took over city thoroughfares, breaking traffic laws with impunity while police stayed in the background. Every month, Critical Mass cyclists ride through rush hour traffic in cities across the country. Some insist the ride is just a "celebration." Others acknowledge a political agenda: they want to enlighten the rest of us -- greedy capitalists that we are -- about the joys of bike riding so we can join them in saving the planet. The Mass...