(court issues order granting plaintiffs' renewed motion for class certification; case involves antitrust action brought on behalf of dairy farmers against milk cooperatives and processors that alleges monopolization and conspiracy to fix milk prices; court discusses extent to which intra-class conflicts of interest bar class certification and whether creation of subclasses remedy such conflicts; court also discusses how defendant avoids class certification by attacking plaintiff's expert). Note: On Jan. 22, it was reported that the defendant agreed to pay $158.6 million to settle the plaintiffs' claims.