Jackie Robinson received this note on May 22, 1951, before a double-header in Cincinnati:

WE HAVE ALREADY
GOT RID
OF SEVERAL
LIKE YOU
ONE WAS FOUND IN RIVER
JUST RECENTLY
ROBINSON
WE ARE GOING
TO KILL YOU
IF YOU ATTEMPT
TO ENTER A
BALL GAME AT
CROSLEY FIELD

It was signed THE TRAVELERS.

Robinson hit a home run in the first game.