Labor Radio looks back at the close ties between the Reverend Martin Luther King and the labor movement and tells what is happening in the Madison area this holiday weekend, a nurse discusses the Oregon Nurses Association strike against Providence Health in that state, the SEIU rejoins the AFL-CIO, workers and community members rally at an Amazon-owned Whole Foods store in Philadelphia ahead of a unionization vote later this month, and South Central Federation of Labor President Kevin Gundlach talks about labor and the April election in Wisconsin, which includes an important state Supreme Court race.