Under his leadership , Aum Shinrikyo has changed its name to Aleph , the first letter of the Hebrew alphabet .
On his release on 29 December 1999 , Joyu became the de facto head of the organisation .
Under Joyu 's leadership , Aum Shinrikyo has changed its name to Aleph , the first letter of the Hebrew alphabet .
On his release on 29 December 1999 , Joyu became the de facto head of the organisation .