CRS Insight via LC – The U.S. Capitol Police: Brief Background, January 12, 2021: “U.S. Capitol Police (USCP) is a department within the legislative branch with security, protection, and administrative responsibilities. The USCP is responsible for law enforcement and security within the Capitol Complex, including the U.S. Capitol building, the Capitol Visitor Center, Capitol grounds, the House and Senate office buildings, the U.S. Botanic Garden, Capitol Police buildings, Library of Congress buildings, and adjacent grounds.  The USCP performs these roles in coordination with the House and Senate Sergeant sat Arms. The House and Senate Sergeants at Arms are charged with maintaining order in their chambers, and they each perform a number of law enforcement, security-related,decorum, and protocol duties. The House and Senate have each had an elected Sergeant at Arms since 1789…”