On January 8, 1970, Yablonski's attorney waived the right to further internal review of the election by the union and requested an immediate investigation by DOL of the 1969 union presidential election. On January 17, 1972, the United States Supreme Court granted Mike Trbovich, a 51-year-old coal mine shuttle car operator and union member from District 5 (Yablonski's district), permission to intervene in the DOL suit as a complainant, which kept Yablonski's election fraud suit alive. Labor Secretary George P. Shultz assigned 230 investigators to the UMWA investigation and Attorney General Mitchell ordered the FBI to join the murder inquiry.