Swiss prosecutors charged a former top executive at Trafigura with facilitating payment of millions of dollars’ worth of bribes to land the energy trader preferential treatment in African oil producer Angola.

Mike Wainwright helped to funnel part of the payments to an Angolan official, Swiss prosecutors said in an indictment at the Federal Criminal Court on Wednesday. These included more than 4.3 million euros, equivalent to $4.6 million, to a bank account in Geneva between 2009 and 2011, and $604,000 in cash payments in Angola.