Four prominent Greek and multinational food companies recalled goods from supermarkets Tuesday after receiving a contamination threat from anarchists. A group calling itself Green Nemesis on Monday said it had tainted several dozen units of products by Coca-Cola, Nestle, Unilever and Greek dairy giant Delta. "We have appropriated products from the main supermarket chains in the greater Athens area," the group said in a statement posted on an anti-establishment website. "The products have been poisoned with chlorine and hydrochloric acid," it added. Greek authorities initially said the country's anti-terror squad was looking into the case and the food safety watchdog had also been informed. In a joint statement the multinationals said the recall was "a preventative measure". Delta took the same…