Here are some references articles on Sanctuary Cities:
Sanctuary Cities and States -- Undermining the American Republic, by James Walsh, The Social Contract, Spring 2005.
The Consequences of Sanctuary Policies and What You Can Do about It, by Dave Gibson, Winter 2013.
Sanctuary Cities Endanger - National Security and Public Safety, by Michael W. Cutler, Senior Special Agent, INS (Ret.), The Social Contract, Winter 2016.
America's 'Sanctuary Cities' and Their Tragic Consequences, by Davd Gibson, The Social Contract, Spring 2016.
The Social Contract Journal, Spring 2016, “Sanctuary nation”.
Sanctuary Cities Vs. National Security and Public Safety - Why sanctuary citys mayors should be given an MVP Award by ISIS and drug cartels, by Michael W. Cutler, Senior Special Agent, INS (Ret.), Frontpagemag, November 22, 2016