Due process limit on penalty for refusing excessive demand

It does not merely provide a reasonable incentive for the prompt settlement, without suit, of just demands of a class admitting of special treatment by the legislature ... but attaches onerous penalties to the nonpayment of extravagant demands, thereby making submission to them the preferable alternative. Thus, it takes property from one and gives it to another, not because of a breach by the former of a duty to the latter or to the public, but because of a lawful exercise of an undoubted right.