The Unknown Regions Pirates, also known as the UR Pirates, were a group of pirates based in the Unknown Regions and made daily raids on the United Systems of the Unknown Regions, giving many supplies to the USUR enemy, the Confederate Systems of the Unknown Regions, in exchange for money and other supplies, such as weapons or food. The UR Pirates were the biggest pirate group in the galaxy and helped organize and establish the Pirates Union. They signed the Mand'alor-Chiss-Exchange Pact as the Pirates Union and contributed to the war effort in the Unknown Regions with the CSUR.