A group of investors victimized by R. Allen Stanford’s $7 billion Ponzi scheme along with their receiver have filed a lawsuit seeking $1.8 billion in damages from the law firms of Greenberg Traurig and Hunton & Williams.

The malpractice lawsuit, filed Thursday in U.S. District Court in Dallas, targets the two firms where Stanford’s lawyer, Carlos Loumiet, once worked, and also names a former Stanford employee and Loumiet protege, Yolanda Suarez.