How can I compare the ways in which Animal Farm and The Crucible condemn the misuse of power?

The two novels present the misuse of power in different ways, but the situations have some commonalities.
In The Crucible, the government of the town remains intact, but everyone in it is tainted—including Reverend Hale, an outsider. The powers that be aim to return the town to its supposed pre-crisis harmonious normalcy. The threat of witchcraft in the town is ostensibly spiritual but turns out to be social.
In Animal Farm, some of the community members stage a revolution. They aim to create a radically different form of government, an allegorical representation of communism. Corruption builds gradually as a few individuals crave power and manipulate others to get it.
Shared features include characters' use of manipulation and deceit as a way to get what they want. Sacrifice for the greater good, and the futility of it, are also common in both. Blindness to the excesses wrought by corruption is another commonality, as the characters forge ahead on a misguided path despite evidence of imminent disaster.

One way of comparing the two is by looking at how the respective authority figures fall short of living up to their principles. In Animal Farm, Napoleon claims to have established a new society based on the principles of Animalism. Having been liberated from the cruel tyranny of Mr. Jones, the animals are supposedly now free to lead happy, fulfilling, prosperous lives. The reality, of course, is very different. Far from creating paradise on earth, Napoleon and his gang have created a brutal tyranny in which the animals are terrorized, starved, and forced to slave away in atrocious conditions, largely for the benefit of the ruling pigs.
In The Crucible, Salem is effectively a Calvinist theocracy. The people of the town pride themselves on being God-fearing Christian folk. Yet there is precious little evidence of Christ's teachings in the hysterical craze that holds the town in a vicelike grip. There is not much in the way of loving one's neighbor in the endless round of false accusations and lies that swirl about the town like dead leaves in the fall.
In both Animal Farm and The Crucible, tyrannies have been established in places where they really ought not to have been.

Throughout Animal Farm, Orwell condemns the misuse of power by depicting how Napoleon tyrannically rules the farm. Napoleon requires the animals to work long hours, barely feeds them, and suppresses their individual freedoms using threats, manipulation, and propaganda. Napoleon selfishly uses power to advance his own agenda and secure his position as leader. The other animals suffer because of his tyrannical decisions and some animals even lose their lives during Napoleon's violent purges. Napoleon is always quick to punish those who challenge his authority and conditions on the farm mirror those under Mr. Jones's reign by the end of the novella. Throughout the play The Crucible, Arthur Miller depicts how the officials of Salem refuses to recognize that their court is corrupt. Deputy Governor Danforth and Judge Hawthorne reject any criticism of their rulings and believe that any person challenging their authority is colluding with the Devil. Despite ample evidence that their court is corrupt, Danforth uses his position of authority to advance his agenda. As a result, honorable men and women die because of the court officials' stubborn, malevolent decisions. Both works depict how authority figures suppress individual rights and use their positions to selfishly advance their own agendas. Innocent citizens suffer at the hands of oppressive, selfish authority figures throughout both works.