Association of Worlds
The Association of Worlds, or (United) Federation of Planets, "is a group of physical and non-physical beings from many realms who come together for a number of purposes. Some have called them a galactic confederation or federation. There is no hierarchical structure or authority inherent in the Association. The primary purposes for their interactions with Earth are: (1) to gently nudge humanity toward a greater awareness of itself and its place within the Association, and (2) to prevent a critical number of nuclear explosions on Earth, which can cause a rip in the fabric of space/time, affecting the galactic neighborhood. They have absolutely no intention now of evacuating anyone from Earth under any conditions. They understand the absolute necessity for the human race to become responsible for itself." (Prism of Lyra).
The RA Material refers to them as the Confederation of Planets. It specifies that it consists of approximately 53 civilizations, comprising approximately 500 different worlds. Most of these would be of higher Densities, i.e. fourth and higher. Interestingly, the RA Material states that beings from Earth from a higher density than ours (i.e. 3rd - assumed to be referring to Ascended Masters), are included, as are higher-density beings from other planets within our solar system.
Please keep in mind that expressions like "Association of Worlds", "Federation of Planets" or "Confederation of Planets", or "Galactic Federation", are just different ways to denominate the same organization. Being an extraterrestrial organization, the original name of the organization is of course not an English one. Both expressions are merely two different English 'translations' of one and the same name, of one and the same organization.
Note that most the information on the Association of worlds is channeled, though corroborated by many contactees, and by some witnesses working on covert projects. Remote viewers, too, confirm the existence of such an organisation.
The organization is mentioned, e.g., in the RA Material, the Council of Nine channelings, the work of Lyssa Royal