I didn't really follow along at the time, but there was a bunch of noise (http://www.cnbc.com/2014/11/19/senate-panel-accuses-goldman-sachs-of-manipulating-me

I didn't really follow along at the time, but there was a bunch of noise (http://www.cnbc.com/2014/11/19/senate-panel-accuses-goldman-sachs-of-manipulating-metal.html http://www.cnbc.com/2014/11/19/senate-panel-accuses-goldman-...) about Goldman manipulating aluminum markets last year. Googling turns up more about it.