article_snippet.sent: Tim Massad, the head of the Commodity Futures Trading Commission, which oversees the trading of futures and swaps, said on Wednesday that it took so long to charge Sarao because of the size and complexity of U.S. derivatives markets. '
article_snippet.sent: These are huge markets,' Tim Massad, the head of the Commodity Futures Trading Commission, which oversees the trading of futures and swaps said. '