Sources? Copyright issues back then were a bit tricky. 28 years with mandatory registration, and so Stravinsky's Rite Of Spring (1913) is around the line of 27 years to Disney's Fantasia (1940), and if Stravinsky didn't register it, then the only organization they'd have to pay is the Philadelphia Orchestra, depending on when it was recorded...
Whether they were required to or not doesn’t matter at all. They didn’t pay him. They could have payed him even if they were not required to by law.