defendant-appellee United Mine Workers.
They are the latest appeals in this circuit which present the conflicts between the national policy opposing trusts and monopolies (Sherman Antitrust Act §§ 1 and 2, 15 U.S.C. §§ 1, 2 (1964)), and the national policy favoring collective bargaining (National Labor Relations Act § 1, 29 U.S.C. § 151 (1964); Norris-LaGuardia Act §§ 1, 2 and 5, 29 U.S.C. §§ 101, 102, 105 (1964); Clayton Antitrust Act §§ 6 and 20, 15 U.S.C. § 17 (1964), 29 U.S.C. § 52 (1964)). Plaintiffs are coal operators in southeastern Tennessee who allege that defendant, United Mine Workers of America, entered into a national conspiracy with certain major coal producers to create a monopoly, to suppress competition, and to drive plaintiffs (and other marginal operators) out of business.
At the outset we note that of all the major coal companies, whose economic interests defendant is alleged to have conspired to serve, none were joined as co-defendants at trial.
In all controlling respects the issues presented by these appeals are identical with the major issues in the Pennington cases which have been the subject of original trial, judgment, and affirmance by this court, Pennington v. United Mine Workers, 325 F.2d 804 (6th Cir. 1963) reversal and remand by the United States Supreme Court, Pennington v. United Mine Workers, 381 U.S. 657, 85 S.Ct. 1585, 14 L.Ed.2d 626 (1965), retrial and judgment, Lewis v. Pennington, 257 F.Supp. 815 (E.D.Tenn.1966), and affirmance of judgment on retrial by this court, Lewis v. Pennington, 400 F.2d 806 (6th Cir. 1968), cert. denied, 393 U.S. 983, 89 S.Ct. 450, 21 L.Ed.2d 444 (1968). The opinions of Justice White in the Supreme Court remand of Pennington, of Judge Peek in the latest consideration of Pennington by this court, and the opinion of Judge Wilson, who tried these cases without a jury and entered thorough findings of fact and carefully reasoned conclusions of law, Ramsey v. United Mine Workers, 265 F.Supp. 388 (E.D.Tenn.1967), should serve to foreshorten our appellate consideration.
Appellants present three questions before this court:
• Does the Sherman Act place any restraints on national collective bargaining?
• Should the court have found there was an agreement between UMW and BCOA that uniform labor terms would be imposed on all bargaining units throughout the industry?
• Should the court have concluded that there was an illegal combination or conspiracy between UMW and business groups, even if the proof were insufficient to establish a specific agreement to apply uniform terms industry-wide ?
Only the last two of these questions are pertinent to decision of the instant appeals. And we decline the invitation to write an advisory opinion on the first question seeking to interpret or expand on the views of the United States Supreme Court, as particularly expressed in Pennington v. United Mine Workers, 381 U.S. 657, 85 S.Ct. 1585 (1965); Allen Bradley Co. v. Local 3, IBEW, 325 U.S. 797, 65 S.Ct. 1533, 89 L.Ed. 1939 (1945), and United States v. Hutcheson, 312 U.S. 219, 61 S.Ct. 463, 85 L.Ed. 788 (1941).
The second issue requires us to determine whether or not the Supplemental Agreement of 1958 (the Protective Wage Clause) between the Bituminous Coal Operators Association (BCOA) and the United Mine Workers of America (UMW) constituted an express or per se violation of the antitrust laws. The specific language complained of follows:
“The United Mine Workers of America (which, as used in this Clause, includes all of its Districts, Local Unions, Officers or Agents) and the Operators signatory hereto affirm their intention to maintain the integ