When advocates of bimetallism referred to the crime of '73, they were talking about the financial panic that hit the united states in 1873. ulysses s. grant's return to the oval office for a second term. the decision by congress in 1873 to stop buying and minting silver. the decision by congress in 1873 to stop buying and minting gold?

The correct answer is:

The decision by Congress in 1873 to stop buying and minting silver.  

The Coinage Act of 1873, signed into law by President Ulysses S. Grant, was a general reform of the laws associated with the Mint of the United States.

The act was later criticized by advocates of bimetallism as the "Crime of '73" because it ended bimetallism in the United States, by setting the nation on the gold standard.  

.elections are held to determine who serves in congress.