What vice have the pigs now adopted This is against what commandment?

The pigs have adopted the vice of engaging in trade and making deals with humans, which goes against the commandment that states, "No animal shall engage in trade." This shift represents a betrayal of the principles of Animalism, as the pigs increasingly resemble the very humans they initially sought to overthrow, highlighting the corruption of power and the erosion of the original ideals of the revolution.