If you go back into the archived threads it’s all there, particularly in the article on medium that is linked “the truth about the alt right a destruction by facts and logic”.
1) David Myatt, the founder of the group, was deeply involved in the British far right. This by itself is evidence.
2) On top of this, he and many of his mentors were involved in fed groups such as “the league of empire loyalists”. Google them, as well as many others.
3) on top of that, he himself was involved in loyalist paramilitaries, which were literally all MI6 ops, who sent troops to Israel etc.
3) on top of loyalist paramilitaries, he was also a member of column 88, which was a Nazi paramilitary/ street gang organisation which was set up under operation Gladio, if you don’t know what Gladio is, just ask.
4) the 09A were deeply involved in AWD, which was a bunch of feds.
5) he regularly associated with old actual Nazis who escaped to various places such as Egypt and continued to do intelligence work
6) a wealth of circumstantial evidence, including the actual make up and beliefs of O9A which more or less align entirely with the CIA strategy of tension, creation of MKULTRA’d assets and extreme physical training, as well as the fact that the actions they take are directed against the left.
7) the entire far right from hitler onwards is an OP
I’m sure there is a bunch I’ve missed out but it’s been a year since I wrote the article