The following info is listed in order of the game's retail release.
Initially listed as merely "a mysterious crime organization", the game's literature mentioned little more than listing some of Shadaloo's ranks, as well as the members in order of seniority. Led by M. Bison, Shadaloo's base in Thailand (appearing to be vaguely near Bangkok) played host to the second World Warrior tournament.
Initially, Shadaloo's goals and scope were ambiguous at best. They appeared to be smugglers, though of what is not explained. Bison is described as "ruling his empire with an iron fist", possibly indicating that he controlled some independent territory. Each of the bosses were motivated by their own self-centered desires, and accepted Bison's offer to join his rank based on wealth or opportunity. Balrog was hired as an enforcer to expand his wealth, whereas Vega was a well-paid assassin. Sagat was Bison's right-hand man and Shadaloo's second-in-command, who was motivated by revenge against Ryu. Some of the other characters (specifically Chun-Li and Guile, later joined by T. Hawk and Cammy) entered the tournament to defeat M. Bison and Shadaloo.
As more games in the series were produced, more bits of information regarding Shadaloo came to light. In , it was divulged that Shadaloo was responsible for the massacre of T. Hawk's tribe, and that it smuggled biochemical drugs and/or weapons. In addition, a storyline skimping on details was introduced between Cammy and Bison, alluding to the fact that Cammy worked for Bison before her bout with amnesia.
Shadaloo's motives, capabilities, and scope were much further revealed. The crime organization appeared to be paramilitary, with very powerful capabilities. Shadaloo bases were identified in Thailand and Brazil that seemed to contain technology and weapons sufficiently advanced to rival a medium-sized nation. Bison had control of a very large VTOL (vertical take-off landing) jet and employed scientists to create cyborgs, clones, human experiments, mind-control rays, satellites, powerful weaponry, large-scale attack robots, and the Pyscho Drive.
In Street Fighter Alpha 3, a series of plots showed the downfall of at least one of Shadaloo's bases in Brazil and a great weakening of Bison. Shadaloo would continue to have a large presence during the second World Warrior tournament. However, the end of that tournament resulted in the death of Bison by Akuma. Tidbits of storyline info indicate that after Bison's death, Balrog sought to replace him as the head of Shadaloo. Due to his being horribly inadequate for the leadership of such a vast empire, Chun-Li was able to systematically shut down Shadaloo operations to the point of its total collapse.
The remaining scientists and smugglers of Shadaloo were transferred over to S.I.N. under management of Seth to work behind the scenes on new weapons and the BLECE project. Unbeknownst to Seth, the scientists also worked on a new body for M. Bison.
By the time Street Fighter V takes place, Shadaloo is still active. M. Bison has a new plan involving a huge weapon to conquer the world.
Street Fighter III seriesEdit
After the events in Street Fighter V, Shadaloo has fallen (as noted by Urien in his pre-fight quote against Chun-Li) by the time Street Fighter III takes place. According to Street Fighter III supplementary books, Shadaloo's conception and its actions were planned by the Illuminati, but Bison is said to be unaware of their influences.