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

Insurers Win $18-Million Judgment: Three insurance carriers won an $18-million default judgment Thursday in a health insurance fraud case against two Soviet emigre doctors--brothers David and Michael Smushkevich--whom the companies claimed operated 240 dummy medical labs in California. U.S. District Court Judge John Davies ruled for Aetna Life Insurance Co., Metropolitan Life Insurance Co. and Employers Health Insurance Co. (Filed Oct. 23, 1986. Case No. CV-866955)