Butler told the Byline Festival on Saturday that her party must understand that socialism is "not a dirty word"
Sadiq Khan
EXCLUSIVE: The Information Commissioner rebuked the Conservatives after they sent out thousands of leaflets which tricked voters into handing over their personal data
Rishi Sunak's party has been accused of lying to the public after posing as independent fact checkers during the BBC Leaders Debate
The Conservative candidate against London Mayor Sadiq Khan joined a series of events with the extreme anti-ULEZ campaigner