20. Which of the following labor activists founded the American Federation of Labor?

A. Terence Powderly

B. William Sylvis

C. Uriah Stephens

D. Samuel Gompers

The activist which founded the American Federation of Labor was D) Samuel Gompers. The American Federation of Labor was a cluster of labor unions all headed by the same person. Usually, these labor unions were based on people who worked in the same type of specific industry, however it started to become more generalized as it continued on in the years. The American Federation of Labor is now the longest lasting and most influential labor federation in the United States.