By Ben Aris in Berlin The shadow leader of a group of former shareholders who was at the centre of a years-long campaign against the Russian metallurgical company Metalloinvest and its sanctioned shareholder Alisher Usmanov has been accused of putting pressure on lawyers and attempting to defraud them on two separate occasions, bne IntelliNews has learned. Joachim Steinhöfel, a prominent German media rights attorney who represents Usmanov, told bne IntelliNews that he had received a letter from Andrei Ivanov, the leader of a group of former minority shareholders of the Lebedinsky Mining and Pr…