What does it mean to look "suspicious"?

It's a question a lot of Twitter users are asking on what would've been Trayvon Martin's 23rd birthday.

In case you need a refresher: Six years ago, Florida resident George Zimmerman — who was on local neighborhood watch duty after a string of local robberies — called the Sanford Police Department to report Martin for being "suspicious."

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In the 1960s, New York City Police Commissioner Michael J. Murphy enacted a series of policies that put Harlem under what was effectively a police state.

It was the dawn of the modern civil rights movement, and racial tensions were high. Murphy promised to be tough on "racial extremists" and even refused several times to listen to the pleas of civil rights groups who wanted an investigation into police brutality.

The Harlem riot of 1964. Photo via Dick DeMarsico/New York World Telegraph & Sun/Wikimedia Commons.

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