I love Tariq Ali's first autobiography, "Street Fighting Years," covering the 1960s to 1980. His recollections about organizing protests against the Vietnam War while hanging out with John Lennon convey the enormous optimism of that generation. This enormous second volume fills in the blanks, covering not just his childhood but his family history back to his grandparents, and also everything he's done since 1980. Ali has given us a complete overview of his life, including lots of miscellaneous essays at the end. As the UK's great left-wing intellectual, he met everyone, went everywhere, and got everything right. Along the way, he managed to write a vast quantity of articles, history books, novels, TV shows, plays, etc.
Ali was a leader of the Trotskyist movement for 13 years, from 1968 to 1980, but he strikes me above all as a consistent democrat. He came from the same milieu that built the Pakistani state, and one can almost imagine him as prime minister — but he is too firmly committed to democratic principles to join such a deformed semi-colonial endeavor. It testifies to the enormous magnetism of Trotskyism in the 1960s that the Fourth International won him over. Whenever revolutionary movements get stronger, Trotskyist ideas spread. I have read the criticism that some of this book feels implausible — I have trouble believing that Trotskyist leaders privately praised his rather mean-spirited novel about breaking with the movement (Redemption, 1990). But I suspect this is the same kind of editing we all do with our memories.
tldr: Definitely read Ali's first autobiography. If you loved that too, dig into this much longer one as well.