However, the Nonintercourse Act itself does not abrogate state sovereign immunity. Hayes vetoed the bill, believing that the United States should not abrogate treaties without negotiation. The Congress voted against a proposed bill to abrogate treaties with Indian Nations. Congress may, however, abrogate a tribe's sovereign immunity pursuant to its plenary power. The king, supreme though his power might be, could not abrogate, modify or infringe them. Nations can, and do, abrogate the rule on a bilateral basis by treaty. Parliament passed the 24th Amendment in 1971 to abrogate the Supreme Court judgement. Slesinger then attempted to get the A.A. Milne Trust to abrogate its contract. Furthermore, the turn to Vaishnavism did not abrogate the royal personality cult of Angkor. Machines started to abrogate the need for human power in life. Key therapeutic targets to abrogate hyper-inflammation in CRS are IL-1, IL-6, and GM-CSF.