Student leaders rallied Bangladeshis for a nationwide civil disobedience campaign as the government weathered a worsening backlash over a deadly police crackdown on protesters. Rallies against civil service job quotas sparked days of mayhem last month that killed more than 200 people. Troop deployments briefly restored order but crowds hit the streets in huge numbers after Friday prayers in the Muslim-majority nation, heeding a call by student leaders to press the government for more concessions.