The Union of Progressive Peoples (U.P.P.) was a wide-reaching and powerful socialist human entity active during the 22nd century. The U.P.P. controls their own sector of space and is notably divided from and opposed to the Weyland-Yutani Corporation and the United States Colonial Marine Corps.
The U.P.P. discovered and boarded the USS Sulaco after the ejection of the hypersleep pods containing Ripley, Corporal Hicks, Newt and Bishop. The UPP soldiers were attacked by Xenomorphs aboard the Sulaco. The survivors took samples and collected Facehuggers then brought them down on to LV-426 for further study. Their plan was spoiled when a group of Colonial Marines dispatched from the USS Sephora killed all of the U.P.P. personnel and destroyed their satcom.
William Gibson's Alien III
While the U.P.P.'s only official appearance to date is in the video game Aliens: Infestation, the faction in fact originated in an unproduced script for Alien3 written by William Gibson. In the screenplay, which picks up after Aliens, the USS Sulaco drifts into an area of space claimed by the Union of Progressive Peoples due to a navigational error. The ship is boarded by U.P.P. commandos as a result, one of whom is attacked by a Facehugger hiding in the entrails of Bishop's mangled body. The U.P.P. then take Bishop's body and the Xenomorph genetic material it is contaminated with into their own possession for further experimentation.
Throughout the the script, the U.P.P. acts as an ideological and political opponent to the unnamed faction to which the main characters belong. The two factions are said to be engaged in an ongoing arms race, mirroring the opposition between the Western Allies and the Soviet Union during the Cold War, although the U.P.P.'s equipment and technology is displayed as being significantly behind that available to the main characters. While the two factions never engage each other during the course of the story, much dialogue is devoted to their tense, hostile relationship. At the end of the story, the main characters are saved by a U.P.P. commando, and Bishop proposes that their respective governments need to put aside their differences and unite against the threat posed by the Xenomorphs.
- The Union of Progressive Peoples is heavily inspired by the Soviet Union. In Gibson's script, their members are said to hail from countries that, at the time of writing, were the core of the communist bloc, including Russia and Vietnam. Much of their dialogue is also infused with clichéd socialist terms and language.