A two-block alley in San Francisco has become a microcosm of escalating tensions over the city's homelessness crisis.
About a month ago, residents of Clinton Park, an area close to the city's Mission District, raised money through a Facebook group to erect two dozen giant boulders along the sidewalk. The rocks were placed there to bar homeless individuals from setting up tents in a two-block alley. See the rest of the story at Business Insider
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