She called herself the "Cryptoqueen" and touted her purported new digital currency, OneCoin, as the next big thing.
But after convincing investors around the world to send her $4 billion, federal prosecutors say, Ruja Ignatova quietly hopped a flight to Greece and disappeared.
OneCoin, authorities say, was a scam. On Thursday, the FBI placed the alleged fraudster on the 10 Most Wanted list, days after Europol did the same.
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