An alleged leader of a violent left-wing extremist group in Germany has been taken into pre-trial detention following his arrest. The detention order was executed by an investigating judge at the Federal Court of Justice (BGH) in the south-western city Karlsruhe, a spokeswoman for the Federal Prosecutor’s Office said on Saturday. The authority accuses the man, identified as Johann G under German privacy laws, of membership in a left-wing extremist organization. Johann G is reported to have belonged to the Leipzig group led by student Lina E and to have held “a prominent position” alongside her…