During the 1990s, Benjamin focused on countering what she believed was unfair trade as promoted by the World Trade Organization. She participated in an anti-sweatshop movement, initiating campaigns against Nike and clothing companies such as the GAP. In 1999, Benjamin helped expose the problem of indentured servitude among garment workers in the United States territory of Saipan (the Marianas Islands), which led to a billion-dollar lawsuit against 17 United States retailers. In 1999, she produced the documentary "Sweating for a T-Shirt" about the sweatshop industry.