A psychadellic Japanese apocalypse cult that at it's height had tens of thousands of members, a small arms and chemical weapons factory, connections to the yakuza and international arms dealers, and a dedicated shock corps made up of former and current Japanese cops and military. The group is best known for carrying out the 1995 Tokyo Subway sarin attack. The entire story is beyond fucking insane, but one of the key parts of their belief system was that to kill another person was to free their karma, so you were doing them a favor.