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Tracy Martin is convinced that neighborhood watch volunteer George Zimmerman racially profiled his son. The teen's Feb. 26 shooting has ignited a national discussion of race relations.

Special prosecutor Henry Schuelke, who earlier this month issued a blistering 500-page report about the Justice Department's actions, is due to testify.

The Supreme Court recently said police overstepped their legal authority by planting a GPS tracker on the car of a suspected drug dealer without a search warrant. The decision set off alarm bells at the FBI, where officials are trying to determine whether they need to change the way they work.

The sheer number of law enforcement officers makes it hard for big gangs to meet openly in New York City the way they did back in the 1980s, so many gang members who have left state prison have migrated north. Authorities say they brought shootings and stabbings with them.

The chatter ranged from denial to outrage about the news that one of their own had cooperated with the FBI.

Federal prosecutors have charged five men with responsibility for some of the biggest computer hacks in the past few years. The FBI says the hackers penetrated the computer systems of businesses like Fox Broadcasting and Sony Pictures, stole confidential information and splashed it all over the Internet.

Robert Levinson disappeared five years ago this week on Kish Island, Iran.

The 28-year-old New Yorker allegedly cooperated with authorities leading to five other arrests.

Egyptian authorities believe the man is Saif Al-Aldel who is on the FBI's "most wanted terrorists" list because of his involvement with the bombings of the U.S. embassies in Kenya and Tanzania.

The files paint a portrait of a man admired for his brilliance but whose personal life and character are often questioned.