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It was a busy year for federal authorities pursuing insider trading cases, such as the one against hedge fund manager Raj Rajaratnam. Investigators say that success comes largely from their decision to attack insider trading the way they take down the Mafia and drug cartels — with wiretaps, informants and cooperators.

Because Wade Michael Page killed himself, we may never know his motive for opening fire on a temple. In the end, six people were killed. The FBI says there is no evidence his affiliation with white supremacist groups led to the shootings.

The four suspects were interested in training in Taliban camps in Afghanistan; three of the suspects were arrested in California, a fourth is being held in Afghanistan.

Lana Peters, who died last year, defected to the U.S. in 1967. The Associated Press, citing newly declassified documents, says the FBI was trying to gauge how the former Svetlana Alliluyeva's defection was affecting international relations.

CIA Director David Petraeus' resignation after admitting an affair has been at the top of the news all week. Regardless of professional accolades, it's often a long road to recovery from such a public downfall, says Eliot Spitzer, the former governor of New York who himself resigned after a prostitution scandal.

Host Scott Simon speaks with Pulitzer Prize-winning author Tim Weiner, who wrote two books on the security services, about the FBI's role in the investigation into generals David Petraeus and John Allen. Weiner says the one possible crime is the conduct of an FBI agent who brought information to Congress.

The FBI review of sensitive email messages between former CIA Director David Petraeus and his biographer-mistress Paula Broadwell has been raising big questions about Big Brother. One of them: When can federal law enforcement review a person's private communications?

The investigation into the former CIA director's extramarital affair has now ensnared the top U.S. commander in Afghanistan. Investigators found thousands of communications between Gen. John Allen and a Tampa woman. He says they were not inappropriate. The sordid story is getting confusing.

Members of Congress say they'll investigate why the FBI and Justice Department didn't tell them earlier about an investigation involving former CIA Director David Petraeus. But the legal authority for reporting such sensitive information to lawmakers is murky.

The FBI notified Petraeus that it was aware of his relationship with author Paula Broadwell after the two exchanged hundreds or thousands of emails.