By Jeff Ostrowski

For decades, Charles Ponzi has been known as the king of the scammers. But Bernard Madoff makes Ponzi look like a piker.

After all, Ponzi raised a measly $15 million back in 1920, a fraction of the $50 billion Madoff is alleged to have swindled.

In one tactic repeated by Madoff, Ponzi insisted that he couldn't reveal his method for profiting from this difference in currency values. The strategy, he argued, was a trade secret.

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