Oil Made the Osage the Richest People on Earth. Their Neighbors Married Them for the Inheritance and Killed Them.

In the early 20th century, the Osage Nation became the richest people per capita in the world after oil was discovered beneath their reservation in northeast Oklahoma. Then they began to die.

The killings, which newspapers called the "Reign of Terror," concentrated between 1921 and 1926. At least 60 wealthy, full-blood Osage people were reported dead from 1918 to 1931. Oil rights couldn't be sold to white settlers, but they could be inherited. The loophole became a blueprint for calculated violence: some white settlers deliberately married Osage headright holders, positioning themselves as legal heirs before killing their spouses.

Court-appointed white "guardians," ostensibly assigned to protect the Osage, stole at least $8 million by one government estimate. When the Osage Tribal Council finally demanded federal intervention, the Bureau of Investigation badly bungled the early investigation, releasing a notorious outlaw from jail to use as an informant, who promptly robbed a bank and killed a police officer.

J. Edgar Hoover, appointed acting director at 29, feared the scandal could undermine his ambitions. In 1925, he brought in a field agent named Tom White to take over. The former Texas Ranger assembled an undercover team that included a Native American agent. White cracked the murders of Mollie Burkhart's family, exposing a conspiracy by cattle baron William Hale, who had orchestrated killings by shooting, poison and bombing to inherit the oil rights.

Hale was tried four times before a federal court finally convicted him in 1929. For the dozens of murders he allegedly orchestrated, he was found guilty of just one. The rest remain cold cases.

Later research found that the 24 murders that brought in the Bureau only hinted at the scope of the killing, with evidence that deaths began at least three years before 1921 and continued for six years after 1925.

The institution built to protect the Osage stole from them. The institution built to investigate the murders botched it first. The man convicted of orchestrating a campaign of serial murder served 18 years and went home.

Read the full story at History, May 28, 2025

Hot Take: Guardianship courts, inheritance law, federal indifference: this wasn't a conspiracy that slipped through the cracks. It was the cracks.