June 1: British Overseas Airways Corporation Flight 777, a DC-3 with registration G-AGBB (formerly KLM PH-ALI, Ibis), on a scheduled passenger flight, is shot down over the Bay of Biscay by German Junkers Ju 88s; all 17 persons aboard perish, including the actor Leslie Howard. There is speculation that the downing was an attempt to kill the Prime Minister of the United Kingdom, Winston Churchill, as the Germans may have had wrong information he was aboard.

June 3: The Zoot Suit Riots erupt between military personnel and Mexican American youths in East Los Angeles.

June 4: A military coup d'état in Argentina ousts Ramón Castillo.

June 8: Japanese battleship Mutsu is destroyed by an accidental magazine explosion in Hashirajima anchorage, killing 1,121.

June 21: British saboteurs blow up the strategically significant railway viaduct at Asopos in Greece.

June 22: The U.S. Army 45th Infantry Division lands in North Africa, prior to training at Arzew, French Morocco.

June 30: United States Civilian Conservation Corps abolished.

June (late): The last trainload of Jewish prisoners is moved from Belzec extermination camp in Occupied Poland (for gassing at Sobibor) and for the remainder of the year the Nazis make efforts to obliterate the site. (source: Wikipedia)