The Tojo Clan (東城会, Tōjō-kai) is a yakuza group based in Kanto, of eastern Japan. It is the second largest yakuza group in the country, only second to the Omi Alliance based in western Japan. It was founded by Makoto Tojo, and had upwards of 100 families containing over 30,000 members total at its peak. Its headquarters are located in Tokyo.
The Tojo Clan was founded by the first chairman Makoto Tojo on an unspecified date. The earliest part of Tojo Clan history seen in-game is 1980, when the Dojima Family carries out the Jingweon Massacre, killing 33 of the Jingweon Mafia's members in Shinjuku, including most of its leaders. The Tojo Clan is known have to existed in the 1960's
Five years later, in 1985, the clan gets into hot water when the Ueno Seiwa hit happens, where a member of the Tojo Clan's Sasai Family massacres men from the Ueno Seiwa Clan. It turns out that the hit was originally going to be used by the family's patriarch Hideki Sasai as a means to defuse and mediate the ongoing conflict between both clans, but botched some time before the hit.