Short answers, pulled from the story.
ABKCO Industries was established in 1968 and the acronym stands for Allen and Betty Klein and Company. Allen Klein founded the company to manage rights to music by the Rolling Stones, the Animals, Herman's Hermits, and the Kinks alongside the historic Cameo Parkway label.
ABKCO Records sat on the entire catalog of music from artists like Chubby Checker and Bobby Rydell to prevent the release of original versions for compilations. This policy forced artists to re-record their hits for inclusion on bargain-basement oldies LPs and effectively erased the authentic sound of the era from the market until Jody Klein took over.
The court ruled that George Harrison committed copyright infringement regarding his song My Sweet Lord and He's So Fine by the Chiffons. ABKCO was also found guilty of breaching their fiduciary duty by purchasing Bright Tunes with intimate knowledge of the defendant's defense, and the district court's decision was upheld by the appellate court.
In May 2019, Mick Jagger and Keith Richards of the Rolling Stones handed back the rights to all future royalties of the songs to the Verve. This move marked a significant shift in the band's history as they had been under ABKCO's management for decades and the label's control over the catalog was absolute.
ABKCO Records has released soundtracks for the television shows Big Little Lies, Boardwalk Empire, and Californication, and for films such as Joy, Safety Not Guaranteed, Our Idiot Brother, Fast Five, The Worlds End, Scott Pilgrim vs. The World, Percy Jackson & the Olympians: The Lightning Thief, and The Men Who Stare At Goats. The label also served as a production company on Regina King's 2020 film One Night in Miami.