I do generally think it’s more of a case where American workers are often reactionary due to America’s overall circumstances and Material Conditions in the broader geopolitical landscape, than anything else. Nationalism is a big thing in America, Union or not.

Imperialism also inflates Worker’s living standards, as well as keeping a domestic underclass of immigrants willing to work for the barest wages via threat of expulsion. Unions can often be anti-immigration because of this, additionally adding to reactionary rhetoric among unions.