In 1909 the AFL designated the Sunday preceding Labor Day as Labor Sunday. On that day, the AFL asked church leaders to include, or allow, a presentation during the service that addressed issues important to wage earners, such as labor's right to organize, the concept of fair wages, and the value of trade unionism.
In 1910 representatives from local central labor councils worked with religious leaders to present labor's point of view from the pulpit and newspapers covered the story. Take a look at these reports to see how labor presented its message, how religious leaders responded, and how the idea of Labor Sunday was received in two very different cities: Chicago, a strong union town, and Los Angeles, a center of opposition to union labor.
Chicago Tribune: 1910 #1, 1910 #2 , 1910 #3
Los Angeles Times: 1910 #1, 1910 #2