The sweeping arrests of dozens of Saudi businessmen, officials, and even royalty on Saturday – culminating in the arrest of Prince Alwaleed bin Talal, who is all three, and one of the richest men in the world – is one of the most dramatic events in the Kingdom’s modern history. It is a clear sign of power consolidating around Crown Prince Mohammed bin Salman, upon whom a great deal of President Donald Trump’s Middle East policy is based.