The man holding the USSR flag later marched in the May Day parade next to a flag with the images of Karl Marx, Friedrich Engels, Vladimir Lenin, and Josef Stalin.
The Soviet Union murdered tens of millions of its citizens.
The Occupy movement is not mainstream.
Occupy Chicago May Day photo: Bill Ayers and Bernardine Dohrn
Occupy Chicago May Day video: Teamsters boss swats down my camera
Occupy Chicago May Day video: 'Rent-a-mob' protesters
Video: Anarchists march with Occupy Chicago on May Day
Video: Occupy Chicago taunts mounted police officers
Occupy Chicago May Day march pics you won't see in the establishment media
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