Black Boy

 I think that one person can easily influence the actions of a group. If a person is strong enough in their opinions then they will easily be able to persuade an entire group. In Black Boy Richard was persuaded to believe what the people in his 'communist' group believes. He also expressed some of his own opinions and the people believed what it was that he was saying. In my opinion it is easier for a group to influence one person as opposed to a person influencing an entire group because it takes more passion for what you are trying to convince other people about. 

I think that Black Boy is a good example of people being influenced by the ideas of one person. There are various examples of Richard influencing the lives of others and of Richard being influenced by others.