why Does granger visit the Logan’s house

Mr. Granger arrives at the house. He suggests that their loan for the second two hundred acres of land might come due anytime, especially since the bank owner doesn't like people stirring up bad feelings in the community. He adds that he might have to charge his sharecroppers more than their usual portion of cotton that year, so they might not be able to pay their debts. Granger leaves after saying he plans to get the land back and that there are a lot of ways of stopping David Logan. Papa says he better make them good.