The Space Warriors were an eco-terrorist organization led by Twinkle Maria Murdock.
The groups' members were initially a good group of preservationists who helped to make the star system a better place, until Murdock took over the role as leader. Over time, they became militant and bought weapons. They attacked anyone they thought as harming nature.
Eventually, they created a plan to infect the moon of Ganymede with a genetic-altering virus by capturing an expert and forcing him to work for them. Their plan was thwarted by the crew of The Bebop when they were trapped in hyperspace and one of their samples of virus was unknowingly broken on the ship. 
In order to disguise themselves, they wear masks bearing the likeness of the Ganymede Sea Rat.