Representatives of the South African wine industry challenged the report's findings. Su Birch, chief executive of Wines of South Africa, said: "Most of the farm workers interviewed were identified by unions and NGOs, who have a vested interest in presenting the worst of cases. The report plays down the significance of the wine industry's substantial direct financial and indirect contribution to improving working conditions through Wieta [the Wine Industry Ethical Trade Association] and fair trade and empowerment schemes. [also refers to Tesco]