June 21 is the 172nd day of the year. There are 193 days remaining until the end of the year.
+ 1964 – Three civil rights workers, Andrew Goodman, James Chaney and Mickey Schwerner, are murdered in Neshoba County, Mississippi, United States, by members of the Ku Klux Klan.
+ 1982 – John Hinckley is found not guilty by reason of insanity for the attempted assassination of U.S. President Ronald Reagan.
+ 1989 – The U.S. Supreme Court ruled in Texas v. Johnson that American flag-burning was a form of political protest protected by the First Amendment.
( Births )
+ 1947 – Wade Phillips, American football coach
+ 1982 – Prince William, Duke of Cambridge