Hundreds of chanting anti-war protesters lined Fifth Avenue on Thursday and dozens rushed into the street and lay down at the beginning of a series of civil disobedience actions planned for throughout the day. Officers, some in riot gear and on horseback, clamped plastic handcuffs onto about 150 protesters who refused to get up, and half-carried them into police vehicles. Anti-war groups have called for a day of widespread civil disobedience, including blocking busy intersections and a “die-in” to protest media and corporate “profiteering from the war.” As helicopters hovered overhead, the protesters — some beating drums and chanting “Hey-hey,...