What is meant by Social Gospel and how was this concept put into action?

The Social Gospel movement was a Protestant Christian intellectual movement that took place in the late 19th century and early 20th century. This movement applied Christian ethics to social problems, especially justice, inequality, liquor, crime, racial tensions, slums, poor hygiene, child labor, and the danger of war.

Two main leaders of this movement were Walter Rauschenbusch, a theologian for the Social Gospel, and Washington Gladden. These two leaders helped popularize the Social Gospel movement through books, lectures, and hymns.