In that era you also had your upper-middle class and your lower-upper class and off on the side were the collar classes, white and blue.
dict.youdao.com
不但是蓝领阶级，连白领阶级的人也一样，在劳动节都不工作，因为劳动节是美国及加拿大的国定纪念日。
Not only blue-collar workers but white-collar workers as well do not have to work on Labor Day because it is observed as a legal holiday in the United States and Canada.
