At first, officials tried to play it down as just another street battle between left-wing students and right-wing bullyboys even though it left at least twelve dead and hundreds injured. But the bloody clash, which erupted two weeks ago when armed thugs calling themselves "Falcons" tore into a peaceful protest march in Mexico City, is shaking the country's government to its foundation.
Attributing the attack to "mercenaries in complicity with inferior authorities," President Luis Echeverria Alvarez last week announced the resignation of the country's second most powerful figure: Mexico City Mayor Alfonso Martinez Dominguez, the former boss of Mexico's long-dominant...