Quote:
	
	
		| 
					Originally Posted by benjulmag  I am not an antitrust lawyer but I would think it is an unfair trading practice and violates the Sherman Antirust Act.  A refusal to crossover expresses the opinion that company A got it wrong.  By constantly doing that company B would be besmirching company A's reputation, causing it to lose substantial business and maybe go into bankruptcy.  I would think that is actionable. | 
	
 Suppose B just announces a policy that it will not cross over cards in other holders, period.  With some narrow exceptions, which I won't bore you with, refusals to deal (which that would be akin to) even by a monopolist are not antitrust violations.  A company generally can deal or not deal with whom it pleases at least insofar as the Sherman Act is concerned.  Also, as to your hypothetical, I don't buy the premise that refusing to cross over a card is somehow tantamount to libel.  And even if it were, there are some pretty onerous requirements before you can convert a business tort into an antitrust violation.
PS I am only responding to your antitrust point.  I would have to think about other possible claims, and who would have standing to bring them.