Freemasonry is a fraternal organisation that arose from obscure origins in the late 16th to early 17th century. Freemasonry now exists in various forms all over the world, with a membership estimated at around 5 million, with around 480,000 in England, Scotland and Ireland alone, and just under two million in the United States.

The various forms all share moral and metaphysical ideals, which include, in most cases, a constitutional declaration of belief in a Supreme Being.

http://en.wikipedia.org/wiki/Freemasonry

A few famous freemasons

http://freemasonry.bcy.ca/textfiles/famous.html

famous Masons from around the world
Mustapha Kemal Ataturk

President and 'Father' of modern Turkey.

Presidents of the USA:

George Washington
James Monroe
Andrew Jackson
James Polk
James Buchanan
Andrew Johnson
James Garfield
William McKinley
Theodore Roosevelt
William H Taft
Warren G Harding
Franklin D Roosevelt
Harry S Truman
Lyndon B Johnson
Gerald Ford

http://abbey.lodge.org.uk/famous-masons.htm

The United Grand Lodge of England is the governing body of Freemasonry in England,

The United Grand Lodge of England has some 270,000 members grouped in 8,322 lodges.

http://www.ugle.org.uk/ugle/intro.htm

he Square and Compass is one of the most prominent symbols of Freemasonry. The "G" in the middle has been claimed, without authority, to represent either God or Geometry. It has also been ascribed to the Worshipful Master's word.