National leaders need security protection against political assassinations, espionage, terrorism and many other dangers, and therefore almost every country has a specialized organization to provide such protection. In the United States, the President is protected by the Secret Service of the Treasury Department, and in the Soviet Union, the Kremlin denizens were guarded by the Ninth Directorate of the KGB. The Chinese security system for the top leadership, consisting mainly of the Central Security Bureau in Zhongnanhai, is however distinctive in several respects. Institutionally it has a peculiarly complex set of arrangements which result in some puzzling divisions of responsibilities. It also relies heavily on a military detachment, Unit 8341. Above all, the Chinese central security apparatus can, and does, play a more active and indispensable political role than is common in other countries.