In a series of arrests of high-profile princes, Saudi Crown Prince Mohammed bin Salman has once more shown he will brook no royal challengers. Four senior princes -- Prince Mohammed bin Nayef, a former crown prince; his brother, Prince Nawaf bin Nayef; Prince Ahmed bin Abdulaziz, the 78-year-old brother of King Salman; and Prince Nayef bin Ahmed, Prince Ahmed's son and former head of army intelligence -- were arrested over the weekend by Saudi security forces. Dozens of other lower-level officials were detained as well. Some news outlets, including The Wall Street Journal and The New York Times, have reported that some princes may soon be released....
