The Sirian Rebels are a particularly nasty offshoot of the benevolent Sirian race. With highly developed technology and advanced psychic powers, they are able to subjugate worlds easily. Whilst not directly aligned to the Reptilians, they are equally brutal in their methodologies, seeking more power for self advancement.
The history of their rebellion is somewhat murky, although it does bare a striking resemblance to the rebels from Orion. It’s possible that they are one and the same, as the story is similar. It appears that Reptilians invaded their home-worlds and were eventually repelled. Most of the Sirians integrated back into the overall collective, however, others were angered at the response from the Galactic Federation and the Sirian High Council and decided to break away to form a new civilisation. They adopted the attitudes of their former overlords seeking domination and control of other species. Their view was that they should be able to genetically engineer any form that they wished to be able to use as a host body to incarnate on their planet of choice. This went against the views of the Sirian High Council that put restrictions on the production of lifeforms in order to preserve balance.
The Sirian Rebels disagreed with this restriction, the Prime Directive of non-interference in lesser developed civilisations and the teachings of the Law of One. Some have traded seriously malevolent mind-control technologies to military organisations on Planet Earth. Some of the most egregious and harmful devices have been utilised by the Sirian Rebels on unsuspecting populations.
There is some speculation that the Sirian Rebels occupied Niburu and are related to the Annunaki. Some believe that the creation of the Annunaki was an attempted peace treaty between the Empire and the Galactic Federation through the merger of Reptilian Humanoid and Human genetics. However, while the plan was partially successful, the Reptilian genetics meant that in-fighting between the Annunaki was a frequent occurrence. War broke out again after a period of peace. There is also much conjecture that the Annunaki posed as the Ancient Mesopotamian Divinities – Anu, Enki, Enlil, Ishtar, for example – with corresponding deities in the other pantheons of the world such as Greco-Roman and Norse.
There is a suggestion that the Sirian Rebels were responsible for the creation of the giant Nephilim with the assistance of the Reptilians. This was in order to incarnate onto Earth and takeover the planet by force. The Nephilim were specifically designed to be easy to control and possess. Having bodies that were larger in size than the indigenous population meant that they could take up positions of power easily.
Whatever the truth of their history may be, one thing is for certain. The result of being oppressed by the Reptilians triggered a a schism within the benevolent Sirians. Often, victims become victimisers as a matter of course. It’s a response to trauma and follows the maxim that if you can’t beat them, join them.