Washington is starting to ask the quiet part out loud: who, exactly, is making money off Venezuela’s oil? This week, U.S. Representative Robert Garcia, the top Democrat on a House investigative committee, sent letters to Vitol and Trafigura demanding records of any communications they’ve had with the Trump administration since January of last year. The timing is not subtle. U.S. forces captured Venezuela’s longtime strongman Nicolás Maduro earlier this month, and Washington has since taken control of Venezuelan oil sales…