A bill to amend the Clayton Act to aid the private enforcement of the antitrust laws, by extending the common law of collateral estoppel to litigated antitrust judgements.

Amends the Clayton Act to repeal the provision which renders a final judgment or decree in a criminal or civil action brought under this Act prima facie evidence against a defendant in a subsequent action brought by any other party, in order to permit the application of the doctrine of collateral estoppel to litigated antitrust judgments.