Managing directors and other executives of six major dairy producers have been called to respond to allegations that they formed a cartel between 2004 and 2006, forcing producers to sell their milk at low prices.

Corruption prosecutor Spyros Georgouleas has called executives from Mevgal, Fage, Delta, Olympos, Nestle and Agno-Kolios to provide evidence in response to claims that they blackmailed producers by telling them that none of the companies would buy milk from them if they did not sell at a certain price.

Georgouleas launched the proceedings following complaints from producers.

The dairy companies deny the charges.