It's a bit reversed, labor unions are cooperatives, not the other way around, as cooperatives are more flexible in arrangement than unions.

Don't disagree with the rest of the comment though.

EDIT: also, I wouldn't consider coops an anarchist victory over traditional private companies anymore than democracy over monarchy. The corporation > worker hierarchy is still there, even with the different share distribution. It's a good demonstration of an alternative and underappreciated corporate structure, tho.