Aleph (Japanese: アレフ, Hepburn: Arefu), better known by their former name Aum Shinrikyo (オウム真理教, Oumu Shinrikyō, literally 'religion of Aum Supreme Truth'), is a Japanese new religious movement and doomsday cult founded by Shoko Asahara in 1987. It carried out the deadly Tokyo subway sarin attack in 1995 and was found to have been responsible for the Matsumoto sarin attack the previous year. The group says that those who carried out the attacks did so secretly, without their plans being known to other executives and ordinary believers.
https://en.wikipedia.org/wiki/Aum_Shinrikyo