Hundreds of civil rights protesters shut down the east side of the Mall of America Saturday afternoon on the final shopping weekend before Christmas. The same organizers that led a march from South Minneapolis to City Hall on Interstate 35W as part of nationwide demonstrations against police treatment of black citizens had more than 3,000 people sign up on Facebook to attend the Bloomington megamall the protest. RELATED: Mall of America tells protesters to stay out A crowd of what appeared to…