Key members of Jeremy Corbyn’s team have actively supported “insurrection” and rioting against the police, a Telegraph investigation has found. John McDonnell, the shadow chancellor, Andrew Fisher, Mr. Corbyn’s new political adviser, and John Ross, a close ally and economic expert, have all condoned or justified violence. A trawl by this newspaper of archives, reports and internet postings shows how Mr. Corbyn’s inner circle has frequently supported civil unrest and even praised violent demonstrators—including in one case a hooligan jailed for hurling a fire extinguisher at police from the top of a building. …