In the early 1990s, she brought down John Gotti, the head of the Gambino crime syndicate.
The move came after some councillors were suspected of having ties to the powerful 'Ndrangheta crime syndicate.
Singapore's announcement came as Italian police arrested a Slovenian man suspected to be a member of this crime syndicate.
Days ago, European sporting authorities said they began investigating a global crime syndicate alleged to have fixed soccer matches.
The assassin belonged to the local Nagasaki branch of Japan's largest crime syndicate.
Singapore's announcement also come as Italian authorities arrested Thursday a Slovenian man suspected to be a member of this crime syndicate.
Following the 18-month inquiry, officials also said they have evidence that an undercover Singapore-based crime syndicate is closely involved, working with criminal networks in Europe.
Earlier this month, police in Europe said an organised crime syndicate based in Singapore had been behind the rigging of hundreds of games between 2008 and 2011.
European investigators say they believe Mr. Tan is the leader and financier of a crime syndicate allegedly responsible for fixing hundreds of soccer matches around the globe.
Ratio officials, meanwhile, say Mr. Shukrun hired people with links to a Georgian crime syndicate to threaten Ratio's Mr. Landau and his family into making up Mr. Shukrun's losses.
Mr. Suljic's arrest was an "important" development in the probe into the crime syndicate Mr. Tan allegedly leads, Interpol Secretary General Ronald Noble said, according to the Associated Press.
Mr. Tan is believed by European investigators to be the leader of a Singapore-based crime syndicate at the center of the probe led by Europol, the continent's police coordinating body.
In February, Singapore police said they were questioning the alleged leader of the crime syndicate, Dan Tan Seet Eng, and had tipped off Italian authorities with information about the alleged crime ring.
WSJ: Singaporeans Allege International Dimension in Match-Fixing Scandal
The motorcycle club - the world's largest in terms of membership - has often been linked to organised crime, and is considered an organised crime syndicate by the US Department of Justice.
In February, Singapore police said they were questioning the alleged leader of the crime syndicate and had tipped off Italian authorities with information that led to the arrest of a suspected syndicate member.
They said that a crime syndicate based in Singapore was liaising with criminal networks throughout Europe, and that match-fixing had taken place in 15 countries and 50 people have so far been arrested.
On February 20th around 160 people from Tokyo's Akasaka district sought a court injunction to bar Inagawa-kai, a big crime syndicate, from occupying an office building, arguing that it might bring violence to the area.
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