the pigs move where? why is this important?

One day, the pigs move into the farmhouse. The other animals again feel uneasy, remembering faintly a resolution that forbade such an action. Again, Squealer convinces them that they are mistaken. Napoleon, whom Squealer now calls “The Leader,” should be granted the honor of living in a house. Furthermore, the pigs need a quiet workplace. The pigs are no different than the humans now.

Source(s): http://www.gradesaver.com/animal-farm/study-guide/section6/