Deaths on April 13

Juhan Smuul, Estonian author, poet, and screenwriter (b. 1921)

Juhan Smuul (18 February 1922 – 13 April 1971) was an Estonian writer. Until 1954 he used the given name Johannes Schmuul.

8 Jan

Zulfikar Ali Bhutto
Bowing to international pressure, President of Pakistan Zulfikar Ali Bhutto releases Bengali leader Sheikh Mujibur Rahman from prison, who had been arrested after declaring the independence of Bangladesh.
7 Jun

First Amendment to the United States Constitution
The United States Supreme Court overturns the conviction of Paul Cohen for disturbing the peace, setting the precedent that vulgar writing is protected under the First Amendment to the United States Constitution.
11 Jul

Chile
Copper mines in Chile are nationalized.
21 Sep

Bhutan
Bahrain, Bhutan and Qatar join the United Nations.
24 Nov

D. B. Cooper
During a severe thunderstorm over Washington state, a hijacker calling himself Dan Cooper (aka D. B. Cooper) parachutes from a Northwest Orient Airlines plane with $200,000 in ransom money. He has never been found.