“Almost Banned in Harvard Square Booksellers, a sidewalk bookstall run by a homeless man … is closing today, and with it goes one more quirky piece of Harvard Square. Ken O’Brien, who has sold or given away tens of thousands of books since opening nearly three years ago, is giving away the last of his stash. O’Brien, the first and only homeless person to belong to the Harvard Square Business Association, said he is tired of fighting City Hall.”