Question: The Universe Championships are annual worldwide bodybuilding events organised by which organization, notable previous winners include bodybuilder, actor, and former governor of California Arnold Schwarzenegger and bodybuilder and actor Steve Reeves?
Context: Stephen Lester "Steve" Reeves (January 21, 1926 – May 1, 2000) was an American professional bodybuilder, actor, and philanthropist.  He traveled to Italy in the mid-1950s to star in a series of Italian-made peplum films featuring characters such as Hercules, Goliath, Sandokan and others.  At the peak of his career, he was the highest-paid actor in Europe. Gustav Schwarzenegger (17 August 1907 – 13 December 1972) was an Austrian police chief ("Gendarmeriekommandant"), postal inspector and a senior non-commissioned military police officer.  He was the father of bodybuilder, Hollywood star and former Governor of California, Arnold Schwarzenegger. Arnold Schwarzenegger is an actor and former bodybuilder who served as Governor of California from November 2003 to January 2011 after being first elected in the 2003 recall election and having won re-election in 2006.  It is the first elected office he has held, but was appointed by President George H.W. Bush to the President's Council on Physical Fitness and Sports, in which he served from 1990 to 1993 and was Chairman of California Governor's Council on Physical Fitness and Sports under Governor Pete Wilson. Patrick M. Knapp Schwarzenegger (born February 2, 1968) also known under his mother’s maiden name as Patrick Knapp, is an Austrian-American attorney based in Los Angeles, California.  He is the son of Meinhard Schwarzenegger and Erika Knapp, and nephew of bodybuilder, actor and former Governor of California, Arnold Schwarzenegger. The IFBB Arnold Sports Festival, also known as the Arnold Schwarzenegger Sports Festival is an annual multi-sport event consisting of professional bodybuilding ("Arnold Classic"), strongman ("Arnold Strongman Classic"), fitness, figure and bikini weekend expo.  It was established in 1989 and is named after Arnold Schwarzenegger.  The main event is held annually around late February or early March in Columbus, Ohio, United States by the International Federation of BodyBuilding & Fitness (IFBB).  It is the second most prestigious event in professional men's bodybuilding, physique, figure and bikini; as well as formerly the second most prestigious event in professional female bodybuilding. Chester Yorton (born 1940) is an American former bodybuilder, known as The Father of Natural Bodybuilding for his advocacy of steroid-free bodybuilding.  He defeated Arnold Schwarzenegger at the 1966 NABBA Mr. Universe (amateur) held in London. Michael Katz (born November 14, 1944) is a former American IFBB professional bodybuilder and former professional football player with the New York Jets, most famous for his appearance with Arnold Schwarzenegger in the 1977 bodybuilding documentary film "Pumping Iron". Thal (] ) is a small village in Austria about 3.2 km west from the edge of Graz, Austria's second largest city.  Its population in the 2014 census was 2,240.  It is the birthplace of actor, bodybuilder, and the 38th Governor of California Arnold Schwarzenegger, who lived in Thal until 1966 at age 19.  On July 2011, Schwarzenegger opened his childhood house as the Arnold Schwarzenegger Museum.  It also boasts a modern church. The Universe Championships are annual worldwide bodybuilding events organised by the National Amateur Body-Builders' Association (NABBA).  Originally promoted as the Mr. Universe contest, the event was expanded to include women's classes in 1968.  Notable previous winners include bodybuilder, actor, and former governor of California Arnold Schwarzenegger and bodybuilder and actor Steve Reeves (1926–2000). Suhas Madhukar Khamkar is a professional bodybuilder from India.  A native of Kolhapur region, Suhas comes from a family of fitness experts and bodybuilders.  Suhas's inspiration for bodybuilding can be traced back to his hometown Kolhapur where he grew up watching many wrestlers and bodybuilders.  However, in the year 1997 at the age of 16, Suhas drew inspiration from Arnold Schwarzenegger and embarked on a journey of becoming a world champion in the sport of bodybuilding.  Suhas Khamkar in Mr. India 2012 Event, He got 1st position in 80Kg
Answer: National Amateur Body-Builders' Association (NABBA)