MIAMI (AP) — Three female Wal-Mart (NYSE:WMT) employees have filed a lawsuit in South Florida claiming the retail giant discriminates against women in areas such as wages and promotion opportunities.

The potential class action lawsuit filed Thursday in federal court is at least the fourth in various parts of the country. Others have recently been filed in Tennessee, Texas, and California.

The company insists it has strong policies against any form of discrimination.

The regional lawsuits follow a 2011 U.S. Supreme Court decision that tossed out a national gender bias lawsuit seeking to represent some 1.6 million female Wal-Mart workers. The high court said the allegations were too varied to show a national pattern of discrimination.

Wal-Mart has also said the claims of a few workers are not representative of all employees.

The Motley Fool has no positions in the stocks mentioned above. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.