Swastika
Adopted by Adolf Hitler in the 1920s
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The swastika is one of the most primitive symbols known to man since the beginning of time. This symbol as been chosen by many cultures but it was not until Adolf Hitler adopted it in the 1920 that the swastika became a sign that is quick to be associated with fear and hatred.

Example 1:
Pentagram

Example 2:
President Bush Giving "The Finger"
