One of the more obvious examples of Challenges in achieving liberation is a person or group of people that wishes to keep others in a state of service to them, otherwise known as an oppressor.
In the novel Invisible Man by Ralph Ellison The protagonist, who remains nameless throughout the course of the story, encounters an organization called the brotherhood. For a long time, the protagonist works for them in a struggle to find himself, and throughout the story he uses others to determine his self-worth. Through the brotherhood he does find himself, as a speaker, and the brotherhood uses his abilities to persuade people to join
them.