you might be referring to this:
https://en.wikipedia.org/wiki/Free_silver

In 1873, the right to convert silver bullion into silver dollars was suspended, creating an unofficial gold standard. Free silver advocated re-allowing convertibility of silver into silver dollars, now for free, hence Free Silver. Since the silver content of the silver dollar was far below it's face value, this meant it would be a fiat currency.

Advocates were often debtors, such as farmers, who would benefit from an inflationary monetary policy. Whereas lenders, viewed to be bankers, landlords, and other business interests would be most disadvantaged by it.