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The Mad Bomber of New York on 29th of March, 1950 Sent a note to police warning of a bomb planted at Grand Central Station in New York City, the bomb squad manged to diffuse the bomb.
The Mad Bomber had been targeting New York since 1940 taking a break during World War II and left a total of at least 33 bombs, of which 22 exploded until he was caught.
When the Mad Bomber ( George Peter Metesky ) a disgruntled ex-employee of Con Edison, New York’s electric utility company, was caught in 1957 he was sent to a mental institution where he stayed until his release in 1973.