Wal-Mart warns managers about labor bill

NEW YORK (Reuters) - Wal-Mart Stores Inc said on Friday it has warned U.S. store managers in recent weeks about the possible consequences of a labor-friendly bill backed by Democratic presidential hopeful Barack Obama that would make it easier for workers to form unions.

But the retailer, which has kept its U.S. stores free of unions, stressed it was not telling employees how to vote.