From an article entitled Islamist Infiltration:
In 1980, there were 481 officially recognized Mosques in the United States. Today, there are 1,209, with an estimated 80 percent of those funded and controlled by Saudi Arabia, where the official religion is virulently anti-Western Wahhabi Islam.
Sperry and Gaubatz’s "Muslim Mafia" exposes the Muslim Brotherhood’s activities in America using declassified FBI documents, FBI agent interviews, transcripts of telephone wire taps and thousands of internal documents smuggled out of CAIR headquarters by Gaubatz’s son, Chris Gaubatz, who posed as an American convert to Islam and was hired by CAIR. They demonstrate that the Brotherhood is now a worldwide central clearinghouse for virtually all Sunni terrorist groups, is operating inside U.S. mosques across the country and is in complete control of CAIR and its myriad subsidiaries.