France’s top intelligence official has raised serious concerns about the growing influence of the Islamist group, the Muslim Brotherhood, in the country. According to Bertrand Chamoulaud, who leads the National Directorate for Territorial Intelligence, the group has been steadily gaining power and is now working to turn France into a part of a larger "caliphate" governed by strict Islamic law, known as Sharia.

Chamoulaud revealed that more than 100,000 people attend mosques controlled by...