Tata Consultancy Services Ltd has been sued by a white American information technology worker who accused India's largest software services exporter of overwhelming favoritism toward workers of South Asian descent in the United States. In a complaint filed on Tuesday in San Francisco federal court, Steven Heldt said 95 percent of Tata's 14,000-person U.S. workforce descend from South Asia, primarily India, and that the company violated federal civil rights law by intentionally favoring them in hiring, promotion and termination decisions.