Seventeen people went on trial in the second Moscow Trials.
Many were sent to death for their crimes in the Great Purge.
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The 14th IAAF World Championships opened in Moscow, Russia.
Moscow was mentioned for the very first time in historical records when two princes met there for a great banquet.
Chemical elements Moscovium, Tennessine, and Oganesson were added to the Periodic Table of Elements.
The Moscow Metro was opened to the public.
Adolf Hitler's German military attacked Moscow.