It is important because it establishes the constitution as the supreme law of the land. That means that every person, regardless of their social status, and every state, regardless of their wealth or size, have to obey the constitution. If the supreme court says that something is unconstitutional then it will never be able to exist, and if they say that something has to be done then it will have to be done because of the constitution.
A government that uses fear to rule is said to rely on power
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The Indian Removal act was harsh because many native Americans were forced out of their homes and to a small are when they actually were supposed to own all of it. Another reason it was harsh was because many of them died because of no food, poor living conditions and some of the were simply not fit to make the move.