It is not their wealth and quality of life they were afraid of, I can assure you of that! Or you believe that KGB didn't interfere in the capitalist countries even more? But hey, I can show you even today, in EU, couple of cases of using chemical weapons against people by the FSB(KGB) and a few blown warehouses with weapons. Can you show me a murder or attempt murder by CIA in Cuba, North Korea, China that happened in the last, let's say not 5 years, but 30? Or maybe they interfered because socialist countries waged a war against capitalism as they openly admit? Or maybe you are caring their war now.