The 2023 film "Killers of the Flower Moon" is based on the book of the same title about a gang of killers who targeted wealthy Osage Indians in Oklahoma in the 1920's. The Indians owned oil leases and the gang's method was to have members marry Indian women and then kill the wife's relatives. The film's title comes from an Osage holiday, the "Flower Moon" which occurs in the spring. In 1919 World War I soldier Ernest Burkhart (Leonardo DiCaprio) returns home to Oklahoma and his uncle William King Hale (Robert De Niro) and brother Byron. William is a local leader and secretly the head of a murder gang. Ernest and Byron join the gang and Ernest marries an Indian woman. At one time several gang members bring the proceeds of robberies to a poker game. Various United States bills and coins are shown on a table including Morgan and Peace silver dollars, Barber half dollars, Liberty Head nickels, and Lincoln cents.

Ernest Burkhart returns from World War I to Fairfax, Oklahoma in 1919. He moves in with his uncle William Hale who owns a ranch located in an Osage Indian reservation. Ernest's younger brother Byron also lives there. The Osage reservation has oil which has made the Indians wealthy. The wealth has attracted predators. William gives Ernest a book about the Osage Indians and encourages Ernest to study their customs. Ernest marries an Osage woman named Mollie and has children with her.

William Hale is outwardly a friend to the Indians but actually heads a gang whose scheme is to have members marry Indian women and then murder the wife's relatives so that the wife will inherit the wealth. Byron and Ernest join the gang and wearing hoods conduct holdups of Indians. After one such robbery Byron and Ernest head for a poker game.

The men play for currency, coins, and chips.

Various United States bills and coins are shown on a table including Morgan silver dollars, Barber half dollars, a Liberty Head nickel, and some Lincoln cents.

A Peace silver dollar and some stolen jewelry appear. Ernest has been seeing Mollie, an Osage woman, and finally marries her.

Soon the gang murders Mollie's sister Anna.

William Hale is prominent at the funeral. The Osage send a tribal council including Mollie to Washington D.C. to request federal assistance in stopping the killings. They attend a photo session with President Coolidge.

Eventually federal agents appear and start to work. The agents are from the "Bureau of Investigation" which later became the "Federal Bureau of Investigation" or "FBI". The agents are led by Thomas Bruce White, a former Texas Ranger.

The agents arrest Ernest, William, and members of their gang. Later the gang members are put on trial. Some are convicted and sentenced to prison. Years later a radio program "True Crime Stories" has an episode based on the investigation.

Leonardo DiCaprio as Ernest Burkhart
Robert De Niro as William King Hale
Lily Gladstone as Mollie Burkhart
Jesse Plemons as Thomas Bruce White
Scott Shepherd as Byron Burkhart
Director: Martin Scorsese
Writers: Eric Roth, Martin Scorsese
Based on the 2017 book Killers of the Flower Moon by David Grann