John Davison Rockefeller Jr. was an American financier and philanthropist. Rockefeller was the fifth child and only son of Standard Oil co-founder John D. Rockefeller. He was involved in the development of the vast office complex in Midtown Manhattan known as Rockefeller Center, making him one of the largest real estate holders in the city. Towards the end of his life, he was famous for his philanthropy, donating over $500 million to a wide variety of different causes, including educational establishments. Among his projects was the reconstruction of Colonial Williamsburg in Virginia. He was widely blamed for having orchestrated the Ludlow Massacre and other offenses during the Colorado Coalfield War. Rockefeller was the father of six children: Abby, John III, Nelson, Laurance, Winthrop, and David.

The Ludlow Massacre was a mass killing perpetrated by anti-striker militia during the Colorado Coalfield War. Soldiers from the Colorado National Guard and private guards employed by Colorado Fuel and Iron Company (CF&I) attacked a tent colony of roughly 1,200 striking coal miners and their families in Ludlow, Colorado, on April 20, 1914. Approximately 21 people, including miners' wives and children, were killed. John D. Rockefeller Jr., a part-owner of CF&I who had recently appeared before a United States congressional hearing on the strikes, was widely blamed for having orchestrated the massacre.