The Human Superiority League (often shortened to HSL) is an organization founded in the late 15th millennium on Terra (on the 12th of October 14920, to be exact), advocating for the extermination/enslavement of all cenos species in an interstellar variant of Manifest Destiny.
They have united humans of all colours and creeds (except for space hippies, of course) for this exact purpose. While they are not openly endorsed by any human government, as that might kick off some interstellar war, there are certainly a lot of sympathies for them in the systems on the outer rim of the human-dominated part of the galaxy, since tensions are rather intense there. HSL operates as a semi-state, so to say, since they own a lot of territory in the Milky Way and exist in a rigidly organized society, but they do not have a concrete political system per sé, with their planets being ruled by generals, officers and other commanders who work to make the planet suitable for human inhabitation and to build up an industry that can feed the ever-growing front the HSL is fighting on. Every one of these commanders has his/her own ruleset of guaranteeing the planet is always working at utmost efficiency.
The HSL prefers vehicles that are either fast, long-ranged, extremely tanky, underwater or in space or simple AI-controlled drones, as they view human lives as sacred and AI is still easy to come by in this age, long before the men of iron rose up in rebellion.