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As a native Minnesotan, the news of these raids saddens me. The initial descriptions of what was going on suggests that the police applied excessive force against these people. It looks like police did manage to scoop up some potentially incriminating materials at one of the houses, but as fara as I can see the reports suggests that at other houses no such materials were found. My first guess is that once one of the houses was found to contain such materials, the police overreacted and widened the scope of their operation.
Looking at the comments at the Minneapolis-St. Paul Star Tribune (http://www.startribune.com/politics/27695244.html?elr=KArksLckD8EQDUoaEyqyP4O:DW3ckUiD3aPc:_Yyc:aULPQL7PQLanchO7DiUs) one can see some more about the reaction to the raids. I would guess that a lot of the reaction is based on a latent dislike for the kinds of people who might be involved in protests. Judging from one of the comments, it looks like the reactionary "If you're against the war you're against the troops" style of thinking is showing itself here ("If you criticize the police for this you must have something against police officers").