 Walker's club was frequently raided for breaking laws against gambling, but those arrested were almost always able to escape prosecution.Walker's role in this earned him the nickname, "King of the colored underworld of Denver" and, in spite of his troubles, he was able to keep his position as deputy sheriff until the early 1920s.In 1918, Walker's confederate, Elias Jackson, shot a man named Morris Kirkland when Kirkland attacked Walker outside of his club.