WSLC affiliated unions include: International Brotherhood of Boilermakers, Iron Ship Builders, Blacksmiths, Forgers and Helpers; International Union of Bricklayers and Allied Workers; Comunications Workers of America and affiliates; International Brotherhood of Electrical Workers; International Union of Elevator Constructors; International Association of Professional and Technical Engineers; United Farm Workers; International Association of Fire Fighters; Association of Flight Attendants; United Food and Commercial Workers; Glass, Molders, Pottery and Plastics and Allied Workers International Union; American Federation of Government Employees; International Association of Heat and Frost Insulators and Asbestos Workers; Internation Association of Iron Workers; Laborers International Union of North America; National Association of Letter Carriers; International Longshore and Warehouse Union; Internation Association of Machinists and Aerospace Workers; Marine Engineers' Beneficial Association; International Organization of Masters, Mates, and Pilots; Washington State Nurses Association; Office and Professional Employees International Union; International Union of Operating Engineers; International Brotherhood of Painters and Allied Trades; Paper, Allied-Industrial, Chemical and Energy Workers International Union; International Association of Operative Plasterers and Cement Masons; United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry; American Postal Workers Union; United Union of Roofers, Waterproofers, and Allied Workers; Seafarers International Union; Service Employees International Union; Sheet Metal Workers' International Association; American Federation of State, County, and Municipal Employees; United Steelworkers; American Federation of Teachers; International Brotherhood of Teamsters; American Federation of Television and Radio Artists; International Union of Theatrical Stage Employees; Amalgamated Transit Union; UNITE HERE