Old Major's speech sets the scene for the occurrences in Animal Farm and, although it is centred around the animals own version of the Russian Revolution, it is just as much about the corruption and perversion of the ideal that later becomes symbolized by Animalism as it is about any specific persons from the Revolution.
it is Orwell’s way of suggesting that true equality never will exist.
Orwell, right from the onset, wanted to express his utter disappointment that even the Russians could not get it right and
his criticism stands against any and all totalitarian regimes.
Even at the beginning, it is apparent that "equality" is a very subjective issue and Old Major even discussed the relevance and position of "wild" creatures on the farm, relevant to the novel because it reveals - and foreshadows - the inevitable result.
The main idea therefore is that Old Major does attempt to reduce complex philosophies to something everyone can understand and is is adamant that animals cannot live together with humans - they must overthrow them.
"all the evils of this life of ours spring from the tyranny of human beings."
Old Major has a "dream," a vision
of a society in which ...injustice is swept away and society exists in an ideal state.
His speech is a call to action.