A summary of Southern California-related business litigation developments during the past week.

Credit Card Firms Win Round: A federal judge handed a victory Monday to Visa and MasterCard by temporarily barring 19 telemarketing defendants from laundering credit card sales drafts or indicating that they are authorized to accept Visa or MasterCard charges. U.S. District Judge Edward Rafeedie in Los Angeles issued the preliminary injunction in a suit by Visa International Service Assn. and MasterCard International Inc. The fraud suit alleges that 21 defendants, including telemarketing firms in several states, operated “boiler room” telephone operations in which they obtained consumers’ credit card numbers, then submitted orders for unauthorized charges or failed to deliver ordered merchandise. (Filed July 23, 1990. Case No. 90-3388)