Why do the pigs in Animal Farm hate Moses the raven?

Moses, the tame raven and pet of Mr. Jones--and the author's symbol of organized religion in Animal Farm--is the only animal not present during Old Major's speech that inspires the revolution of the animals. Moses's stories about "Sugarcandy Mountain, where it was Sunday seven days a week, clover was in season all year round, and lump sugar and linseed cake grew on the hedges". The pigs deny the statement that says that hard work and dedication will prevail on the farm. Moses also refuses to do any work, and he leaves the farm whenever the inclination arises. However, later in the story, the pigs recognize that Moses's lies of this fantasy world just beyond the clouds serve as a means of keeping the animals' spirits high during their days of hard work. The pigs allow Moses to stay, preaching his promise of the good life not so very far away, and they even provide him with a ration of beer each day.