From Al Waleed bin Talal wiki (2017 Saudi princes purge)

Main article: 2017 Saudi Arabian purge On 4 November 2017, Al-Waleed was arrested in Saudi Arabia in a "corruption crackdown" conducted by a new royal anti-corruption committee.[48] This was done on authority of Crown Prince Mohammad bin Salman, his cousin (both are grandsons of Ibn Saud, first monarch and founder of Saudi Arabia). Just days before his arrest, Al-Waleed reportedly contacted US-based Saudi journalist Jamal Khashoggi (who has publicly criticized the Saudi government in the past) and invited him to return to the Kingdom in order to contribute to Mohammad bin Salman's vision.[49] The authorities in Saudi Arabia were demanding $6 billion from Prince Al-Waleed Bin Talal, In total, 320 princes, ministers and businessmen were detained.[50] Al-Waleed was released from detention in late January 2018, nearly three months after his arrest,[19] after he and most of the other Saudi notables arrested the previous year had made a financial settlement of some kind with the Saudi government.[18] Prince Mutaib Bin Abdullah, the son of the late King Abdullah (1924–2015), was released after paying a reported $1 billion.[51] According to a Wall Street Journal report, the price for his release was $6 billion.[52] The Saudi Arabia government did not disclosed charges or produced evidence and the negotiations were held in secret.[53]