After being condemned to death in Japan, a Yakuza crime lord made a scary threat to a court.

Following his conviction, crime lord Satoru Nomura, 74, warned the judge, "you will regret this for the rest of your life" It was considered to be the first time a senior person in the Japanese mafia had received the death penalty.

The judge, jury, and a few other public authorities are currently under police protection.

Nomura ordered four attacks, one of which resulted in death, according to a Fukuoka court.

During the punishment, Judge Ben Adachi called his conduct "extremely vicious"

"The criminal acts of attacking and killing civilians for the acquisition of interests is extremely vicious," he continued.

According to the Japan Times, the assaults included the killing of a former leader of a fishing cooperative, a family member of the murder victim, a nurse who had treated Nomura, and a police officer who was shot or stabbed between 1998 and 2014.

However, Nomura, the head of the Kudo-kai syndicate in Japan's southwest, denied any involvement and stated that he intends to appeal.

Fumio Tanoue, 65, the mafia boss's second in command, was also sentenced to life in prison and a fine of $20 million, according to reports.

Because there was no direct evidence linking either of them to the crimes, the trial's main focus was on whether they would be identified as conspiring with underlings who carried out the crimes.

Following several attacks on citizens and businesses, Kudo-kai was recognized as a very dangerous crime syndicate in 2012.

Yakuza membership is not illegal in Japan, thus bosses are not on the run from the government.