DUBAI, United Arab Emirates (AP) — In a kingdom once ruled by an ever-aging rotation of elderly monarchs, Saudi Crown Prince Mohammed bin Salman stands out as the youthful face of a youthful nation. But behind the carefully calibrated public-relations campaign pushing images of the smiling prince meeting with the world's top leaders and business executives lurks a darker side. Last year, at age 31, Mohammed became the kingdom's crown prince, next in line to the throne now held by his octogenarian father, King Salman. While pushing for women to drive, he has overseen the arrest of women's rights activists. While calling for foreign investment, he has imprisoned businessmen, royals and others in a crackdown on corruption that soon resembled a shakedown of the kingdom's most powerful people.