The leader of the Populist Party in Georgia, who later went on to serve in the U. S. House of Representatives, was
Tom Watson
Alonzo Herndon
Joseph Brown
Henry Grady

Tom Watson

Explanation:

In the 1890s, Watson gained his popularity from series of activism that he done in order to improve the quality of life for poor farmers. This was a strong reason why the members of the populist party elected him as the party leader.

In 1891, Watson manage to won the election to be the members of the Congress. Making him became the United States representative for Georgia's 10th district

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is there a year set? the question is incomplete