Will Dominant Images of Conventions Be of Unity or Protest?

Republicans arriving in Cleveland next month to nominate Donald J. Trump will be greeted by as many as 6,000 protesters on the first day, a noisy coalition of dozens of groups, including Black Lives Matter and the Workers World Party. The demonstrators intend to ignore restrictions keeping them far from the delegates, raising fears the violence that accompanied some of Mr. Trump’s rallies will be magnified on a mass scale.