"In the 1920s, the richest people per capita in the world were the members of the Osage Nation in Oklahoma. After oil was discovered beneath their land, they rode in chauffered cars and lived in mansions. Then, one by one, the Osage began to be killed. Mollie Burkhart watched as her family became a prime target. Her relatives were shot and poisoned. Other Osage were also dying under mysterious circumstances, and many of those who investigated the...

Between 1921 and 1923, several members of the Osage Indian Reservation died under suspicious circumstances. The FBI became involved after the Department of Interior wrote to Director William J. Burns requesting assistance in investigating these deaths. William "King of Osage" Hale was suspected of being involved in the deaths. Posing as medicine men, cattlemen, and salesmen, FBI agents infiltrated the reservation and solved the murders. Hale and other...