Washington (CNN) -- The Supreme Court has agreed to decide whether to certify the largest class-action employment lawsuit in U.S. history, a long-standing dispute against mega-retailer Wal-Mart Stores Inc. over alleged gender bias in pay and promotions.

CNN: Justices accept appeal over Wal-Mart gender pay lawsuit

Even long-proven areas of massive exposure like gender or race bias can still catch them short.

FORBES: Wal-Mart Could Face Major Unanticipated Problems in Historic Class Action

To abide by it was an assault to her aesthetic sensibilities and her ethic as the go-to-goddess of tree pruning, to say nothing of the gender bias.

FORBES: Negotiating for Something You Think You Can't Get? Show Up in Drag.