Labor Day began as an idea in the mind of a 19th century labor leader — some say Matthew Maguire, others say Peter McGuire — who cared greatly for a very important segment of the marketplace, its workers.

Regardless of paternity, such a day was first celebrated on Tuesday, September 5, 1882, in New York City, when members of the CLU took an unpaid day off to demonstrate solidarity and, of course, have picnics. And ever since 1884, when President Grover Cleveland’s signature designated the fir...