This is a method is which crime scene is divided into smaller sections and each team member are assigned to search each section. Those sections can be further subdivided into smaller sections for smaller teams to search thoroughly. For the police officers to get the evident inside the room, this method will come in handy as the most effective.
The word or phrase to fill into the gap is the "Ku Klux Klan", an extreme right organization calling for what they would call a "purification" of the US-American society.
