WASHINGTON, March 31 - Samuel R. Berger, the former national security adviser to President Bill Clinton, has agreed to plead guilty to a criminal misdemeanor charge and give up his security clearance for three years after removing classified material from a government archive, the Justice Department and associates of Mr. Berger said today. A well-respected figure in foreign policy circles for many years, Mr. Berger has also agreed to pay a $10,000 fine as part of an agreement reached with the Justice Department in recent days after months of quiet negotiations, the associates said. He is expected to enter his...