WASHINGTON—According to labor union UNITE HERE, a splinter group representing less than one-third of UNITE HERE members is proposing to secede from the union, which would be an alleged violation of the union’s constitution. Bruce Raynor is leading the splinter group, which UNITE HERE says is backed by a campaign of intimidation and harassment of UNITE HERE members. This campaign is being conducted by the Service Employees International Union, according to UNITE HERE.