“Blue-collar” is a term that floats around a lot when people talk about staffing, especially with the rise of e-commerce and warehousing jobs that require manual labor. The term “blue-collar” is used to distinguish workers who work in a trade, often involving manual labor, as opposed to white-collar workers, who work in professional jobs. Blue-collar jobs can range from unskilled to highly skilled and include warehousing, manufacturing, custodial work, construction,...