U.S. multinationals with plants in Venezuela are likely on edge Thursday, after American automaker General Motors (NYSE:GM) pulled the plug on its operations in the poverty-stricken country, following a government takeover of its plant amid large-scale violent protests. “All foreign companies, and especially U.S. firms, should be concerned with the increasingly extreme and aggressive behavior of the Venezuelan regime,” Ian Vasquez, director of the Cato Institute's Center for Global Liberty and Prosperity, told FOX Business. American beverage company Coca-Cola (NYSE:KO), however, indicated to FOX Business Thursday it didn’t have any plans to pull its operations from the distressed South American...