The District of Columbia has agreed to pay $1 million to about 120 protesters who were improperly rounded up by the police during demonstrations against the invasion of Iraq, the World Bank and the International Monetary Fund. The settlement, reached Wednesday, is the largest payout to date by the city for police actions during the Sept. 27, 2002, protests. Charles Ramsey, who was police chief at the time, initially defended the arrests but later acknowledged they were improper.