Wow he's one the good guys - from Wiki:
In 2014 Mann was responsible for compiling a dossier of historic allegations of child abuse, detailing allegations of 12 former ministers that may have been involved. He said he believes some of them were "definitely child abusers".
Mann has been from the outset an opponent of Jeremy Corbyn's leadership. During the leadership campaign he wrote an open letter to Corbyn saying that it would be "inappropriate" for Corbyn to become leader due to allegations that Corbyn had failed to act over allegations of child abuse in his constituency. Just over two months after Corbyn had won the leadership campaign, Mann continued to refuse to back Corbyn in an interview with the BBC, indicating he had no confidence in him. Instead he said that he had confidence in the then shadow foreign secretary Hilary Benn.
I felt tears in my eyes when I heard him speak - to think that those who stand for "right", as opposed to wrong, are targets and harassed along with their families is abhorrent on every level - just like Justine experienced. Why isn't very political leader condemning this despicable harassment? The level of moral leadership in political life today is non existent - that's the real problem.