A planned speech by the controversial Turkish leader Recep Tayyip Erdogan descended into violence and chaos Thursday, with one journalist physically removed from the event site by Turkish security personnel, another kicked by a guard, and a third — a woman — thrown to the sidewalk in front of a Washington think tank where he was to speak. A small group of protesters gathered across the street from the Brookings Institute near Dupont Circle in Washington, with one holding a large sign reading “Erdogan: War Criminal On The Loose,” while another used a megaphone to chant that he was a “baby-killer.”When the protesters tried to cross the street, Washington police officers blocked traffic and physically separated them from Turkish personnel. A Secret Service agent standing nearby told a colleague that “the situation is a bit out of control.”