What is john yakuza?

As an AI language model, I don't have access to information on specific individuals. However, John Yakuza may refer to a fictional character or a real-life person related to the criminal underworld known as the Yakuza in Japan. The Yakuza is a powerful criminal organization involved in various illegal activities such as organized crime, gambling, prostitution, and money laundering. It is also known for its strict codes of honor and deep loyalty to its members. But, engaging in any illegal activities is wrong and against the law.