AFTER the unprecedented CBI vs CBI showdown in Delhi a few months ago, which actually signalled the beginning of a systematic purging of the premier investigative agency in order to pack it with police officers with dubious track record known for their proximity with the trio of Prime Minister Narendra Modi, BJP President Amit Shah and National Security Advisor Ajit Doval, we now saw the bizarre spectacle of an open clash between the CBI and the Kolkata Police.