WASHINGTON AP – The Supreme Court said Monday it will consider whether to keep alive the largest employment discrimination lawsuit in U.S. history, a case that claims Wal-Mart pays women less than men and promotes women less frequently.

The justices stepped into a dispute that could involve billions of dollars in back pay for 500,000 to 1.5 million women who work or once worked at Wal-Mart Stores Inc., the world’s largest private employer. But the case also could affect other class-action lawsuits, in which people with similar interests increase their leverage by joining together in a single claim.