Elaborate plans are underway to encircle and "shut down" the Republican National Convention at St. Paul's Xcel Energy Center in September. The strategies and tactics involved could come straight from a guerrilla warfare manual. Anarchist groups with ominous names -- the RNC Welcoming Committee, Unconventional Action -- have announced a "three-tier strategy" to cut off the Xcel Center. The steps include "blockading" streets and freeways, "immobilizing" delegates' transportation and "blocking" bridges to impede delegates' access to the center. The plan also features a "swarm, seize, stay" strategy. After dividing the city into "sectors," protesters propose to "seize space" through both...