The same Guardian articles that said there was no evidence remember.

"Burnham said Mann's allegations about so-called entryism were not helpful and he had no evidence of entryism on any scale. If Mann had any evidence, he should produce it, Burnham added"

You now start referring to something that happened in the 80's & early 90's

That's more than your 20 year cut off point in other threads and has sweet FA to do with the current election.