For the coup? Yes, Churchill/British Petroleum (Anglo-Iranian Petroleum Company before the rebranding to BP right after the coup) couldn't topple Mosaddegh and asked the CIA for help. Nationalized often means reverting transactions that could be seen as fraudulent, when powerful nations bribe/take advantage of poorly run developing countries/banana republics and suddenly own a large part of the natural resources that then no longer benefit the population. That is the type of communism the US was often afraid of - increasing literacy, healthcare, land reform at expense of foreign private companies.