The Galactic Federation (GF) is a large federation of worlds, universes and galaxies that work in concert to ensure a better and harmonious life for all beings.  In all of the inhabited galaxies there is a Galactic Federation, much like smaller governments overseeing the smaller units of a larger federal body (e.g. States, cities, and counties).  The Galactic Federation for the Milky Way Galaxy is called the Galactic Federation of Worlds, but some of the races represented in our GF may call it by other names, hence the difference in the
names given by the Zetas, Andromedans, and Arcturians.

Arcturians use this federation of planets to help Earth remain an untouched planet by other alien races through diplomacy.  After their short battle in 1947, the Arcturians have been quietly pursuing sanctions against the Greys and Reptilians for violation of the Galactic Federation codes.  Arcturians continue protecting Earth because of the old wars that once plagued Humans and destroyed their home planet.  

The Galactic Federation of the Milky Way is known to be the oldest and most effective of all Galactic Federations found throughout the universe.  It was established after the great galactic wars between the Reptilians, Humans, Felines, and Carians.  The result of this battle left the first Human world (Avyon) destroyed; therefore, all the civilizations came into agreement to create a universal order that can prevent such destruction in the future.  
Humans continue to feel the burden of the old wars and now struggle to re-build their once dying civilization. 

As time passed, certain races continued to struggle against galactic unrest and stronger “galactic civilizations.” Because many were beginning to distrust the new order, largely made up of the Reptilians, many began to wonder the fate of our Milky Way Galaxy.  

Extreme and higher tensions began to affect galactic order, and solutions were beginning to fall short and it seemed like a new galactic war would begin, however, as fast as trouble came a newly discovered race of aliens began to play a more active role in the galaxies ailing federation.  The Arcturian Race (aliens from the Bootes consolation) intervened and
became visible to the many races that had only heard of these mystical creatures.  Because they exist in the 5th & 6th dimensions, they must consciously choose to make themselves visible and in doing so the majority of races realized the powerful Arcturian race was here to create a peaceful balance between all races throughout the galaxy and Universe.  

Today the Arcturians, among other race, control the Galactic Federation of the Worlds that is said to be head-quartered on the star Sirius.  This is why that star has played such an important role on Earth.