Best Labor Unions in Seward, Alaska. Top 30 Labor Unions in Seward, Alaska, ranked by rating, reviews, votes. Last updated on May 2024 . ILWU Seward, Alaska Labor Unions Detail Address: 539 3rd Avenue, Seward, Alaska 99664. Phone: (907) 224-5515. Categories of builders in Seward, Alaska Hardware Construction Machinery Equipment Labor Unions Plumbing Fixtures Supplies Retail