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The roots of the modern sanctuary movement date back to the 1980s. U.S. churches, synagogues and other religious institutions began to provide refuge and services to thousands of undocumented immigrants from Guatemala and El Salvador who had fled civil unrest at home but were denied sanctuary in the U.S., largely due to Cold War politics.

The effort became known as the Sanctuary Movement, and as it spread, a number of cities throughout the country joined in solidarity, passing resolutions to overlook the immigration status of residents.

More in the article, including arguments for and arguments against “sanctuary” policies.

h/t @linzegee