Lawyers representing a California livery service are taking an early shot at getting a federal judge to find that Uber Technologies Inc. is running afoul of the state’s labor laws by classifying its drivers as contractors rather than employees.

Robins Kaplan and Keller Lenkner lawyers sued Uber in September on behalf of Studio City-based Diva Limousine Ltd., which claims that the company saves as much as a half billion dollars in required benefits and payroll costs via its driver classifications. They allege the misclassification allows Uber to target clients with “below-cost and anticompetitive pricing.”