For the past three years, Islamists with ties to the Muslim Brotherhood and terrorist groups have come to Capitol Hill to lobby members of Congress on National Muslim Advocacy Day, an annual event organized by Council on American-Islamic Relations (CAIR) and the U.S. Council of Muslim Organizations (USCMO). At last year’s lobby day, according to the Muslim Advocacy Day website, almost 400 participants visited congressional offices.

I have now published a detailed report at the Middle East Forum that profiles the Islamist activists and officials involved with this lobbying effort, and who have previously met with members of Congress and their staffers. Some of these officials are directly linked to terrorists. Others have invited prominent Islamist extremists into American mosques: providing venues for them to spread their message of hate; funneling money to their networks; and using social media to publicize and encourage their activities.

Some examples of these prominent terror-linked Islamist leaders who have participated in Muslim Advocacy Day include:

1. Oussama Jammal is the secretary general of US Council of Muslim Organizations (USCMO), a coalition of American-Muslim organizations that hosts the Muslim Adovcacy Day. Jammal is also the director of the Muslim American Society – Public Affairs and Civic Engagement (MAS-PACE), a division of the Muslim American Society (MAS), which has been identified in court testimony as a front group for the Muslim Brotherhood.

Jammal is also the vice president of the Mosque Foundation in Bridgeview. In 2003, Jammal raised $50,000 at a Mosque Foundation prayer service for terrorist operative Sami al-Arian, the then-North American representative of Palestinian Islamic Jihad.

Under Jamaal’s leadership, in 2012, the Mosque Foundation hosted an official delegation of al-Jama’a al-Islamiyya (JI), the Lebanese branch of the Muslim Brotherhood. The delegation included JI officials who are in direct communication with Hamas and Iran’s Islamic Revolutionary Guards Corps (IRGC).