Was the Haymarket Affair positive or negative for the labor movement, and why?

A.
Positive, because it showed most Americans the injustices that workers faced.
B.
Negative, because it caused the downfall of the Populist movement.
C.
Positive, because it made the U.S. government finally turn against large companies.
D.
Negative, because many Americans started fearing that organized labor was connected with radical politics.