Yes there are. In 1978, a dozen children in the Netherlands and West Germany were hospitalized after eating oranges imported from Israel. The Abu Nidal Organization, using the nom de guerre the Arab Revolutionary Council, deliberately contaminated the fruit by injecting it with mercury in an attempt to damage the Israeli economy. In another case in 1984 (one of the few known successful attempts at using a biological agent to contaminate food in the United States) in the small Oregon town of The Dalles, followers of cult leader Bhagwan Shree Rajneesh, attempted to manipulate a local election by infecting salad bars in 10 restaurants with Salmonella typhimurium, causing about 751 people to become ill!
In Greece in December of 2013 the organization Informal Anarchist Federation/International Revolutionary Front, cores Nicholas and Alfredo warned in a statement to the press, that it had contaminated products of Coca Cola and Nestle with hydrochloric acid as a sign of solidarity with two of its members, who were imprisoned in Spain for placing explosive devices. Its actions were dedicated to all cores of the organization worldwide. That was the first time of such a terrorist practice in foods in Greece. The result was a series of product recalls and statements of the above companies in a period of high sales because of the terrified consumers.