With our partners in the law enforcement and intelligence communities, the FBI worked thousands of investigations during 2011, from cyber and hate crimes to public corruption and multi-million-dollar fraud schemes. As the year draws to a close, we take a look back at some of 2011’s most significant cases. 

Part 1 focused on terrorism. This segment highlights some of the year’s top cases from the FBI’s other investigative priorities:

Martin Luther King Jr. Day attempted bombing: A Washington state man was sentenced to 32 years in prison last week for attempting to bomb a Martin Luther King Jr. Day parade last January in Spokane. Details

International cyber takedown: Six Estonian nationals were arrested last month for running a sophisticated Internet fraud ring that infected millions of computers worldwide with a virus and enabled the thieves to manipulate the multi-billion-dollar Internet advertising industry. Details

Operation Delta Blues: After a two-year investigation dubbed Operation Delta Blues, 70 individuals—including five law enforcement officers—were charged in Arkansas in October with crimes including public corruption, drug trafficking, money laundering, and firearms offenses. Details

Corporate fraud scheme: The former chairman and owner of Taylor, Bean & Whitaker (TBW), a privately held mortgage lending company, was sentenced in June to 30 years in prison for his role in a more than $2.9 billion fraud scheme that contributed to the failure of TBW and Colonial Bank, one of the 25 largest banks in the U.S. Details

James “Whitey” Bulger arrest: Top Ten fugitive James “Whitey” Bulger was arrested in June thanks to a tip from the public—just days after a new FBI media campaign was launched to help locate the Boston gangster who had been on the run for 16 years. Details

Cyber fraud organization disruption: In an unprecedented move in the fight against cyber crime, the FBI disrupted an international cyber fraud operation in April by seizing the servers that had infected as many as two million computers with malicious software. Details

Southwest border gang arrests: Thirty-five members and associates of the Barrio Azteca gang were charged in March with various counts of racketeering, murder, drug offenses, and money laundering. Ten of the defendants were Mexican nationals and were also charged in connection with the 2010 murders in Juarez, Mexico of a U.S. Consulate employee, her husband, and the husband of a U.S. Consulate employee. Details

Health care fraud takedown: Twenty individuals, including three doctors, were charged in South Florida in February for their participation in a fraud scheme involving $200 million in Medicare billing for mental health services. The charges coincided with a national federal health care fraud takedown involving 111 defendants in nine cities. Details

Selling secrets for profit: A 66-year-old resident of Hawaii was sentenced in January to 32 years in prison for communicating classified national defense information about U.S. military planes to the People’s Republic of China, along with illegally exporting military technical data and other offenses. Details

Massive Mafia takedown: Nearly 130 members of the Mafia in New York City and other East Coast cities were arrested in January in the largest nationally coordinated organized crime takedown in FBI history. Charges included murder, drug trafficking, arson, loan sharking, illegal gambling, witness tampering, labor racketeering, and extortion. Details