In six years as a member of the Wal-Mart board of directors, between 1986 and 1992, Hillary Clinton remained silent as the world's largest retailer waged a major campaign against labor unions seeking to represent store workers.
Clinton has been endorsed for president by more than a dozen unions, according to her campaign Web site, which omits any reference to her role at Wal-Mart in its detailed biography of her.
Wal-Mart's anti-union efforts were headed by one of Clinton's fellow board members, John Tate, a Wal-Mart executive vice president who also served on the board with Clinton for four of her six years.
Tate was fond of repeating, as he did at a managers meeting in 2004 after his retirement, what he said was his favorite phrase, "Labor unions are nothing but blood-sucking parasites living off the productive labor of people who work for a living."
Wal-Mart says Tate's comments "were his own and do not reflect Wal-Mart's views."
But Wal-Mart founder Sam Walton and other company officials often recounted how they relied on Tate to lead the company's successful anti-union efforts.
An ABC News analysis of the videotapes of at least four stockholder meetings where Clinton appeared shows she never once rose to defend the role of American labor unions.