The Goldman sachs scheme is quite simple.
1.They spread FUD and negative predictions about the future of bitcoin and the btc price.
2.All the newbies ,who believe that Goldman Sachs has any "authority", begin to sell their bitcoins,hence the price  goes down.
3.Goldman Sachs buys cheap bitcoins using shady companies.
This plan works every time,which means easy profits for Goldman Sachs.