There are a couple of ways to look at that composition subject. You might write it as a persuasive paper. As such, try using different examples from local, national, and world history to prove your thesis. Locally, you might use an example of a school where the student body no longer wanted to wear uniforms and petitioned to change the rules so that they had freedom of dress. For national and world events, the American Revolution comes to mind as an obvious example of people wanting freedom and fighting for changes. Recent conflicts in the Middle East might be used as world examples. 

Another way to look at the composition would be to consider this idea: with the very pursuit of freedom, the definition of freedom changes. No one today would say that a country built on the right of freedom of speech and religion should have slaves as a major economic force. However, prior to the events leading to the Civil War, slavery was a normal part of life in the United States. Just as the definition of freedom changes through history, it also changes from place to place. A socialist nation defines freedom from want as freedom, while our country defines free enterprise as freedom. Therefore, the subject of your composition could be that the place and time of the pursuit of freedom changes its definition. 

Reference

Craig, L. (2007). U.S.C. Gould. Freedom's changing face. Retrieved June 28, 2012 from http://weblaw.usc.edu/news/article.cfm?newsID=1202.

You could frame your essay around historical freedom movements, which essentially struggled against people who were resistant to change. In the United States, for example, the twentieth century Civil Rights Movement attacked the laws and customs that upheld segregation in the South. Their struggle was difficult in part because they were pushing for a fundamental change to a social structure that had existed since the end of Reconstruction. While the specifics are up to you to explore, the bottom line is that people pushing for more freedoms are almost always pushing to change the social institutions that are denying them those freedoms in the first place.