What fraternity/sorority have the most active members worldwide?

Question

BUT OF COURSE, EXCLUDE THE FREEMASONS AND THE KNIGHTS OF COLUMBUS. COZ THOSE GROUPS ARE TOTALLY WIDESPREAD. SO, I GUESS, OTHER FROM THEM, What fraternity/sorority have the most active members worldwide?

Answer 1

http://www.kappasigma.org/

Kappa Sigma is one of the largest fraternities in the world with over 250,000 brothers and over 300 Chapters worldwide. Our main objective is to make good men better. This objective rests on the four pillars of Kappa Sigma: Fellowship, Leadership, Scholarship and Service. The Fraternity strives to promote the ideals of brotherhood, contribute to the personal growth and development of its members, promote ethical behavior and decision-making, and serve the community. By diligent adherence to these principles, each member will enhance his college experience, learn invaluable life lessons, and discover new lifelong friendships.

ALSO SEE
http://en.wikipedia.org/wiki/List_of_social_fraternities_and_sororities
http://en.wikipedia.org/wiki/Fraternities_and_sororities
http://en.wikipedia.org/wiki/Cultural_interest_fraternities_and_sororities
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Answer 2

Eagles, Elks, Moose, Independent Order of Odd Fellows, Druids, Knights of Pythias, are all considered to be fairly well known throughout the world.

In the USA might add various Veterans Groups such as the American Legion, Sons of American Legion, Sons of Confederate Veterans of the Civil War, Sons of Union Veterans of the Civil War, Marine Corps League, Veterans of Foreign Wars, and various other groups pertaining to a particular war or event in a war.