What was the crime referenced in the poster for which john brown was arrested and sentenced to hang

john brown was arrested and sentenced to hang because of the Crime of 'Treason'.
Back then, he was accused to supply the slaves with weapon and foods to aid them in creating revolution. The  Commonwealth of Virginia did not take this kindly and decided to eliminate John Brown. After his death, John Brown became a martyr that inspired many people who are dedicated to end the slavery.

Substances can change phase—often because of a temperature change. At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous. The process of a solid becoming a liquid is called melting.