Defying the widening crackdown against them, supporters of the Muslim Brotherhood marched in cities across Egypt on Friday, protesting the government’s decision to declare the group a terrorist organization and clashing with security forces in several places. At least three people were killed in Cairo, Damietta and Minya on Friday, as officers fired tear gas and birdshot at protesters who threw rocks, burned tires and set fire to police vehicles. The Interior Ministry, which oversees the police, said it had arrested 265 people across the country, illustrating the government’s resolve to move forcefully against the Brotherhood, the government’s principal political opponent. Most of the group’s leadership and thousands of its members are already in prison, having been rounded up during a sustained assault on the movement after the military ousted President Mohamed Morsi, a Brotherhood leader, in July. The state’s security services have killed hundreds of Mr. […]