Sanzo Murakawa is a minor antagonist in Syphon Filter: The Omega Strain, and the commander of the Japanese Yakuza gang.
Sanzo Murakawa was the leader in one of Japan's most powerful Yakuza crime familes, and his influence spread throughout the city of Tokyo. He controlled a corporate empire with Murakawa Industries, centered in a tower protected by officers ready to assume his duties and personal bodyguard Iwao Ryusaki, the latter being a hulking giant, who killed his entire family to prove his loyalty to his master.
Mihai Niculescu and Meta Global Funds purchased his company which was used as their primary force in Asia. Murakawa Industries supported the research of the Omega Strain, and had a secure scientific facility on its upper floors for experimenting with viral samples. Murakawa's criminal associations with the CDP and Yong-jun Kim led to an incident where Kim obtained the Omega Strain and North Korea provided Mikhas Ivankov with a nuclear device in exchange.
Murakawa had believed Kim was a South Korean businessman, but he was in fact a North Korean secret police operative acquiring Syphon Filter as a double agent. As such, Kim escaped with the virus. As Niculescu began to shut down other corporations tied to his consortium, he sent Mara Aramov to handle the Murakawa crisis. An Agency operation that attempted to capture Murukawa alive for interrogation went awry when Aramov made him commit suicide for trusting Kim, which he did before the IPCA operatives entered his office.