This is a long, depressing, blockbuster of a piece.
Back in the 1960s I worked on Labour Party political campaigns as part of their youth group, the Young Socialists. My friends and I were definitely on the left, but still mainstream; it was a shock for me to arrive at university in 1969 and encounter the REALLY hard left of student politics.
But now, Labour is just another center-right party, bought and paid for by the City and Israel. It was obvious when Corbyn was defenestrated, but now we have the documentary proof. Sad, and disgusting.