Musar על סנהדרין 215:12

And in the general scope of cruelty is included him who robs his companion of anything and therefore caused him pain. And there is a great punishment in store for him who robs the poor — and one who does so is deserving of death as it is written: "Rob not the weak because he is weak" (Ibid. 22:22). And it is written: "For the Lord will plead their cause, and despoil of life those that despoil them" (Ibid. 22:23). And even though there be greater and more severe sins than robbery the punishment for robbing is very grievous, as it is written about the generation of the flood, "The end of all flesh is come before me; for the earth is filled with violence through them" (Gen. 6:13). Our Rabbis said, "If there is a box filled with sins — there is no more severe accuser among them than robbery" (Sanhedrin 108a). And he who causes pain to an orphan or a widow through robbing them or shaming them or any kind of malicious pain is worthy of death through the power of Heaven. This is also true of judges who have the power to save them from the hand of their oppressors and do not fairly judge the case of the orphan or the widow — they are deserving of death as it is written: "You shall not afflict any widow or fatherless child" (Exod. 22:21). And it is further written: "If you afflict him in any way, for if he comes unto me I will surely hear his cry" (Ibid. : 22). And it is written : "My wrath shall burn and I will slay you with the sword and your wives will be widows and your children will be orphans" (Ibid.:23). Measure for measure: "Your wives shall be widows" for "afflicting widows" and "your sons shall be orphans" for afflicting orphans."