John Brown and his men attacked the U.S. Federal Arsenal. He thought that by stealing weapons he could free slaves. He got slaves and abolitionists to battle against slave owners. http://www.wvculture.org/history/jnobrown.html
A slave sued for his freedom because he was in a free state. The Supreme Court did not allow him to have his freedom because they said he was the property of John Emerson. It made abolitionists mad. http://www.pbs.org/wgbh/aia/part4/4p2932.html