The Greenback movement argued that the previous effort of using an unbacked currency had been sabotaged by monied interests, which had prevailed upon Congress to restrict the functionality of the notes — declaring them unsuitable for the payment of taxes or national debt. This inevitably depreciated the value of the unbacked currency when circulated side-by-side with fully functional gold-backed notes, the Greenback movement argued. Moreover, this differential in values was exploited by speculators, who purchased unbacked currency at a severe discount with gold-backed notes and then pressured Congress into redemption of the same at a 1-to-1 rate — thereby netting the speculator a tidy profit.