The Great Fraud — Cora Buhlert

Charles William Finchley made his fortune selling novelty products of questionable value via ads in the backpages of pulp magazines.
Finchley is well on his way to becoming a millionaire, until his unscrupulous business practices put him in the crosshairs of the Silencer, a pulp hero come to life to fight crime in the streets of Depression era New York.
And the Silencer is not at all pleased that Finchley uses the crimefighter's good name to peddle worthless junk…

This is a short story of 6000 words or approx. 19 print pages in the Silencer series, but may be read as a standalone.