United Automobile Workers v. Johnson Controls, Inc., 499 U.S. 187 (1991), was a decision by the Supreme Court of the United States establishing that private sector policies prohibiting women from knowingly working in potentially hazardous occupations are discriminatory and in violation of Title VII and the Pregnancy Discrimination Act of 1978. The case revolved around Johnson Controls' policy of excluding fertile women from working in battery manufacturing jobs because batteries contain high amounts of lead, which entails health risks to people's reproductive systems and fetuses. At the time the case was heard, it was considered one of the most important sex-discrimination cases since the passage of Title VII.