World's Most Wanted

A Muslim convert born in the UK, Samantha Lewthwaite denounces the 7/7 London subway attack. Later, she's suspected of masterminding acts of terror.

Semion Mogilevich, who's believed to be the "boss of bosses" in the Russian mob, is run out of Hungary and back to Russia. He remains powerful and free.

Suspected of orchestrating the murders of two judges and a series of terror attacks in 1993, Matteo Messina Denaro is still a fugitive at large.