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Enochlophobia, Demophobia or Ochlophobia.
thirty seven percent of the population suffers from a fear of crowds
Enochlophobia is a fear of crowds. Agoraphobia is also caused when a place is crowded.
Demophobia and Enochlophobia are the fear of crowds.
http://www.changethatsrightnow.com/problem_detail.asp?SDID=416:1496
There is no perticular phobia word for that but there is "anthropophobia" fear of people and society, "enochlophobia" fear of crowds.