refers to:
(1) Actual scientific discoveries or inventions that are so hard to believe as to be commonly mistaken for science fiction.
(2) A speculative technological discovery or invention specifically referred to in past science fiction writing that has since become true.
Apparently an invisibility cloak has become science faction as military scientists have discovered a reflective material that can bend light around a subject making the subject effectively invisible.
When the Bolsheviks took over Russia in 1917, they eventually spread across the world to promote their concept of paradise. How they were treated varied from country to country. While some welcomed them, others forced them into a entity of legal discourse. In England, they were not tolerated at all. Any group outside of Labour and Tory was marginalized as much as possible. The political groups thus marginalized away from any real power became known as factions. A Red Factioner is someone from England who is in support of Marxist principles of governance.