The following exerpts are taken from Info Shop News. I'd recommend reading the whole article and related comments:
"While anarchists are organizing for the conventions, what’s going on in boardrooms and at police trainings? What strategies can we expect the authorities to apply at the conventions, and what factors may tie their hands?
Both Minneapolis and St. Paul have liberal governments that need to come across as supportive of law-abiding protesters; in this regard, healthy relations between anarchists and other antiwar organizers constitute a real challenge for them. Officials have emphasized that the police will be civil—not starting in riot gear; that there will be no “free speech zones”—demonstrators will be allowed “within sight and sound” of the Excel Center hosting the RNC; and that the police strategy will not resemble the brutal “Miami model” applied at the 2003 FTAA protests, but rather will establish a new “St. Paul model.” It’s also worth pointing out that St. Paul will be fielding about 3000 police, compared to the tens of thousands on duty in New York City during the 2004 RNC.
All this could change overnight if the powers that be saw a significant threat to their ascendancy; but it suggests that compelling the police to use force at the conventions this summer would be a coup, in that it would frame them as aggressors in a time when they are trying to dispel that image. Rumor has it that the St. Paul police are consulting European police forces for tips on how to control crowds via containment rather than brute force. We should strategize accordingly. "
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What is their main strategy? Blockading!