From Longman Dictionary of Contemporary Englishopinion-makersoˈpinion-ˌmakers noun [plural] TCPPpeople such as politicians or journalists who have a lot of influence on the way other people think
Examples from the Corpus
opinion-makers• It is their voice which is heard, and they often are the opinion-makers in the household and in the local community.• Surprising where you, the opinion-makers, turn up. 