The pigs became increasingly greedy. The animals sensed this but "You don’t want Jones to come back?" and the famous words from Boxer "Napoleon is always right" were two statements, which always were referred back to, to keep order in power by the pigs. The commandments that had been written by Snowball himself had been broken! This was a crime, as the animals had no idea what happened, as they could not read. This caused problems as the rules were broken and the animals were ruled by force (the same as Jones).
From the beginning of the story, the revolution was because Jones had no concern for the animals. This was to give no rations of food to the animals because he was lazy. As the revolution became reality, more rations were given out. The pigs allowed themselves to take advantage of increasing their food rations and decreasing the rest of the animals rations. This was overcome by Squealer who made one of his usual speeches. A major part of this speech was,
"Milk and apples (this has been proved by Science comrades) contain substances absolutely necessary to the well-being of a pig"
There was also another part of the speech, which always ended the importance of the speech, which was all a load of disbelief. "Surely there is no one among you who want to see Jones come back?" This always made the animals think and they would agree to whatever the pigs say.
During the novel, the animals showed fear to the pigs. As the animals became aware of the situation, it was too late. The dogs kept control by force making the authority unequal (dictatorship). This did not keep the pigs from trying to keep the hopes of the animals to the highest level. The windmill and the battles won over the humans, was a way to show power and allow the pigs to show how powerful they are, in keeping the farm in animal ownership.
At the end, all hope was lost, even the name of the farm was changed to Manor farm. The changed were obvious. In Jones time, the food was low and the farm was extremely bad. This changes to an equal opportunity for all animals as the revolution passed. Eventually the greed came out and the pigs became more aware of the weaknesses and took all the wealth for themselves, leaving the animals in the same state as they were from the beginning.