U.S. Attorney General Eric Holder and other officials are expected...

U.S. Attorney General Eric Holder and other officials are expected to discuss the mob cases later Jan. 20 at a news conference in Brooklyn. (Jan. 17, 2011) Credit: AP

Federal agents have arrested dozens of suspected mobsters in multiple investigations of New York’s organized crime families.

The FBI said most of the arrests were made Thursday morning throughout New York City, in New Jersey and New England. Charges include murder, extortion and narcotics trafficking.

Attorney General Eric Holder and other officials were expected to discuss the cases later Thursday at a news conference in Brooklyn.

The takedown was another blow to New York’s five Mafia crime families. Federal probes aided by mob turncoats have decimated the families’ ranks and resulted in lengthy prison terms for several leaders.

Get the latest news and more great videos at NewsdayTV Credit: Newsday

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Get the latest news and more great videos at NewsdayTV Credit: Newsday

Wild weather on LI ... Deported LI bagel store manager speaks out ... Top holiday movies to see ... Visiting one of LI's best pizzerias ... Get the latest news and more great videos at NewsdayTV

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