Here in New York, police arrested 21 activists who disrupted the annual Macy’s Thanksgiving Day Parade on Thursday. The protesters briefly blocked off part of the parade route, unfurling a banner that read, “Don’t celebrate genocide! Arms embargo now. Free Palestine!” The following day, protests unfolded in malls and other retail sites across the U.S. as shoppers headed to stores for Black Friday sales. Palestinian rights groups had called on consumers to boycott Black Friday in protest.