9th » In horseracing, Secretariat (horse) or Secretariat wins the Triple Crown of Thoroughbred Racing called Triple Crown.
20th » 1973 Ezeiza massacre known as Ezeiza massacre in Buenos Aires, Argentina. Snipers fire upon left-wing Peronism called Peronists. At least 13 are killed and more than 300 are injured.
21st » In handing down the decision in 'Miller v. California' 413 US 15, the Supreme Court of the United States establishes the Miller Test for obscenity in U.S. law.
23rd » A fire at a house in Kingston upon Hull or Hull, England which kills a six year old boy is passed off as an accident; it later emerges as the first of 26 deaths by fire caused over the next seven years by arsonist Bruce George Peter Lee or Peter Dinsdale.
24th » The UpStairs Lounge arson attack took place on June 24, 1973 at a gay bar located on the second floor of the three-story building at 141 Chartres Street in the French Quarter of New Orleans, Louisiana. Thirty-two people died as a result of fire or smoke i
26th » At Plesetsk Cosmodrome nine people are killed in an explosion of a Cosmos 3-M rocket.
27th » The President of Uruguay Juan María Bordaberry dissolves Parliament and establishes a dictatorship.
28th » Elections are held for the Northern Ireland Assembly, 1973 Northern Ireland Assembly, which will lead to power-sharing between Unionism in Ireland unionists and Irish nationalism nationalists in Northern Ireland for the first time.