1199SEIU United Healthcare Workers East 300,000 members local health care workers' union Local 1199SEIU local health care workers' union United Healthcare Workers Union 1199 SEIU Healthcare Workers Union 300,000 members 1199SEIU Healthcare Workers East 300,000 members United Healthcare Workers Union local health care workers' union 300,000 members local health care workers' union 1199SEIU Healthcare Workers East SEIU 1199, local health care workers' union claims to be the largest union local Local 1199SEIU local health care workers' union Local 1199SEIU local health care workers' union 1199 SEIU United Health Care Workers East Local 1199SEIU 1199SEIU Service Employees International Union Local 1199 300,000 members United Healthcare Workers East Local 1199SEIU