Antoni v. Greenhow
In Antoni v. Greenhow, 107 U.S. 769 (1882), where it was adjudged that, as an amendment to the law regulating the proceeding by mandamus to compel the acceptance by the officers of the State of tax-receivable coupons in payment of taxes, it was not a law which impaired the obligation of the contract under the act of March 30, 1871.
The court there said:
"The question we are now to consider is not whether, if the coupon tendered is in fact genuine and such as ought, under the contract, to be received, and the tender is kept good, the treasurer can proceed to collect the tax by distraint or such other process as the law allows, without making himself personally responsible for any trespass he may commit, but whether the act of 1882 violates any implied obligation of the State in respect to the remedies that may be employed for the enforcement of its contract if the collector refuses to take the coupon." p. 774. And again: "In conclusion, we repeat that the question presented by the record is not whether the tax collector is bound in law to receive the coupon, notwithstanding the legislation which, on its face, prohibits him from doing so, nor whether, if he refuses to take the coupon and proceeds with the collection of the tax by force, he can be made personally responsible in damages for what he does, but whether the obligation of the contract has been impaired by the changes which have been made in the remedies for its enforcement in case he refuses to accept the coupons." p. 782.