Uprise Brigade

Uprise Brigade, whose members were known as the Uprisers, was a Separatist-backed group of turncoat clone troopers, most of whom with backgrounds in reconnaissance (ARF troopers, ARCs, scout troopers, etc.) and Separatist mercenaries that opposed Republic forces on Coruscant as part of a plan to eradicate the Jedi Order and reform the Galactic Republic into an empire, and thus also had secret financial support from the Imperial Party (who also had an anti-Jedi sentiment). It is believed that Palpatine himself (likely under his persona Darth Sidious) remotely directed some of the group's operations. Their secret headquarters was an abandoned storage facility, which was only a few streets away from the nearest Republic outpost.

One of the mercenaries involved was Naastau, who briefly participated in a failed raid on a Republic special forces training base before returning to his duties in other parts of the galaxy.

History
Uprise Brigade was formed as early as 21 BBY. Their initial attacks took the form of public bombings (most notably in the maintenance level of the Galaxies Opera House) as well as a number of assassination attempts on senators, diplomats, and occasionally Jedi Masters. Other members fought as mercenaries for criminal organizations in other star systems to make money for the group. In mid-19 BBY, the Uprisers launched a failed siege on a Republic special forces training base, which lasted nearly a month before the Uprisers, having lost nearly half of their membership in the attack, retreated to a nearby abandoned storage facility and, under Palpatine's direct orders, remained there in hiding for weeks before the Imperial declaration.

Their goals were eventually met after Palpatine's declaration of the Galactic Empire. For their skill and experience as well as their extreme loyalty to Imperialist ideals, despite having betrayed the Republican government years earlier, led to many Uprisers becoming the first generation of the Storm Commando Program (in reference to the shadow scout program itself, though any special forces stormtrooper could also be referred to as a "storm commando") during the Imperial era, with many former Uprisers continuing Imperial service into the Galactic Civil War. Most of the Separatist mercenaries involved in the movement, however, went on to oppose the Empire and eventually became members of the Rebel Alliance. Many storm commandos were sent to hunt down and eliminate these mercenaries (as they held critical intelligence from the Clone Wars), though only succeeded in eliminating some.

Equipment
Upon being inducted, clone troopers within Uprise Brigade were gifted a set of black-colored armor that was likely just repainted scout trooper armor. It had no notable enhancements, though some clone rebels were seen wielding personal shield generators and integrated rangefinders. This armor later inspired (or was the same as) storm commando armor.

Mercenaries that briefly fought with the group typically wore their own equipment, such as Naastau, who wore his set of enhanced Mandalorian armor during the siege.