The Leftist being Tony Benn, who was a very Left-Wing character who got a lot of love from Leftists across the Anglo-Sphere:

Originally considered a moderate within the party, he was identified as belonging to its left wing after leaving ministerial office. The terms Bennism and Bennite came into usage to describe the left-wing politics he espoused from the late 1970s and its adherents. He was an influence on the political views of Jeremy Corbyn, who was elected Leader of the Labour Party a year after Benn’s death, and John McDonnell, who served as Shadow Chancellor of the Exchequer under Corbyn.

Although he held many contradictions, growing up a committed Christian, and remaining so for decades:

Higgins wrote in The Benn Inheritance that Benn was “a socialist whose political commitment owes much more to the teaching of Jesus than the writing of Marx” (Indeed, he did not read The Communist Manifesto until he was in his 50s.) “The driving force of his life was Christian socialism,” according to Peter Wilby, linking Benn to the “high-minded” founding roots of Labour.

But he also once posed five questions for anyone who wields political authority, and they remain the key ones that every politician should remember every day:

  1. What power have you got?
  2. Where did you get it from?
  3. In whose interests do you use it?
  4. To whom are you accountable?
  5. How do we get rid of you?’