However , United Mine Workers agents conducted overt actions against the strikers , including participation in vigilante raids against IWW property .
Although the United Mine Workers in Colorado had vocally opposed the strike , they had established an official position of neutrality .
United Mine Workers agents conducted overt actions against the strikers , including participation in vigilante raids against IWW property .
Although the United Mine Workers in Colorado had vocally opposed the strike , they had established an official position of neutrality .