See here for an article on the India based “Money life” web site about alleged manipulations in currency and commodity markets using spoofing and other typical manipulation techniques. The allegations include questions about the venues’ surveillance of activity.
No manipulation is alleged in this article on the Bloomberg web site about the purchase of large amounts of oil, and the impact on prices and benchmarks. The article refers to the fact that the purchases are possibly for genuine supply purposes.
This article on the Bracewell blog examines recent disciplinary actions on US Futures exchanges and details fines for various offences including pre arranged trading, and also breaches of exchange position limits.