The World War 2 alliance if the USA, UK USSR & China (as well as many other countries). In TripleA an alliance can have any name desired. Italy also joined the Allies in 1943.
The term allies should not be used for WW1 as the Central Powers initially called themselves the Triple Alliance (Germany, Austria, Italy) as opposed to the Triple Entente (France, Britain, Russia). When war broke, Italy stayed neutral and then changed sides in 1915.