The department shall compile a register of employers who have been found in contempt of court by a federal court of appeals, on not less than 3 occasions involving different violations during the preceding 7 years, for failure to correct an unfair labor practice, as prohibited by section 8 of chapter 372 of the national labor relations act, 29 U.S.C. § 158. The register, which shall be compiled and updated biannually from the records of the national labor relations board, shall contain the names of those employers who merited inclusion in the register during the 3-year period before its compilation and shall be available, upon request, to the state.