What is not true of the haymarket riot

On May 4, 1886, a labor protest rally near Chicago's Haymarket Square turned into a riot after someone threw a bomb at police. At least eight people died as a result of the violence that day. Despite a lack of evidence against them, eight radical labor activists were convicted in connection with the bombing.

Knights of Labor: An Early Labor Organization. ... The organization believed that its predecessors had failed by limiting membership; the Knights proposed to organize both skilled and unskilled workers in the same union and opened their doors to blacks and women.

the answer is d. party organizers, volunteers, voters and elected officials.

c is the correct answer for this question.