Objects in the Oort Cloud are considered refugees from where during the early solar history?

Ejected from the inner solar system

The inhabitants of the Oort Cloud have a distinct history compared to objects residing closer to the plane of the planets. These icy bodies are theorized to be refugees that were violently ejected from the warmer, denser inner and middle regions of the early solar nebula. This outward flinging was primarily caused by the intense gravitational influence of the massive young planets, especially Jupiter and Saturn, during the chaotic early epoch of solar system formation. Consequently, Oort Cloud inhabitants are distinguished from Kuiper Belt Objects—which are often seen as original inhabitants of the outer system—by having experienced a trajectory that forced them into vast, high-inclination orbits, deep in freeze due to their extreme isolation.