Hagerstown is home to the Islamic Society of Western Maryland, an organisation that according to the book "Muslim Mafia: Inside the Secret Underworld That’s Conspiring to Islamize America." the FBI wanted to investigate in 2004 but were somewhat stonewalled with assistance of the Council on American-Islamic Relations.
This was mentioned at the end of an article about an interfaith protest against Trump's travel ban.
http://www.wnd.com/2017/02/christian-activists-head-to-mosques-to-resist-trump/