A bill to assist in the fair and effective enforcement of the antitrust laws.

Amends the Clayton Act to permit a State, or its political subdivision, or the United States to institute an action to recover damages for price fixing, even though they were not direct purchasers. Permits a State attorney general to institute such an action on behalf of a natural person who was not a direct purchaser.

Entitles a defendant in an antitrust action to prove as a partial or complete defense that the plaintiff has passed on to others all or part of the damages claimed. Authorizes the court to award a reasonable attorney's fee to a prevailing defendant in such an action upon finding that the plaintiff has acted in bad faith.