I represent a group that was collectively scammed for over 100000 BTC by Trendon Shavers of Texas, USA.  Are you familiar with the case?

There are dozens and dozens of threads here on these forums about him and many elsewhere on the Internet, just Google "Trendon Shavers".

IIRC he already has a default judgement against him by the SEC for $143 million (he ignored the SEC certified mail and did not appear).

Trouble is, since he was running a Ponzi, he claims there is no money or BTC left - it was used to pay the interest to those that did get out with a profit.

Interest?  Is this the kind of thing you are looking for?