Sheridan trial witness gives lies warning
Colin Fox, who gave evidence against Sheridan - a former Scottish Socialist Party ally - said lies destroyed reputations.
Speaking ahead of a visit to Fettes College, where he was invited to put the case for socialism, he said the truth was an "essential principle" in the fight for socialist change.
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Hide AdHe said: "The truth is that socialist ideas are more necessary in today's world than ever."
Mr Fox also criticised one of Fettes' most famous alumni, former Prime Minister Tony Blair, accusing him of lying in his case for the war in Iraq.
He said: "From Tony Blair's lies of Iraq to Tommy Sheridan's lies in the Court of Session, the impact on the reputation of the individuals and what they stand for is devastating."