Throughout many of his endeavors, Marshall turned most of his business associations into friendships; including J.R. Parten, Fred Koch and his sons, Oscar Wyatt and E.O. Buck.
In 2007 he pled guilty in U.S. federal court in Manhattan to illegally sending payments to Iraq under the Oil for Food program.
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As Coastal's petroleum marketing and production assets were being sold off piece by piece to competitors Valero, Sunoco, and Conoco Phillips, Oscar Wyatt was being investigated for illegally doing business with Iraq's Saddam Hussein in violation of United Sanctions that strictly regulated Iraqi sales of crude oil.