Significant event involving the labor movement and violence occurred during the Progressive Era in the late 19th and early 20th centuries?""
a-The implementation of the Wagner Act, guaranteeing worker safety.
b-The Haymarket Square Riot of 1886, where a labor protest turned violent
c-The establishment of the American Federation of Labor (AFL), leading to labor harmony.
d-The passage of the Sherman Antitrust Act, promoting labor rights.