What happened to the leaders of the Revolution by 1960 in the book 1984?

In George Orwell's 1984, the leaders of the Revolution, initially seen as liberators, become indistinguishable from the oppressive regime they sought to overthrow. By 1960, the Party, led by Big Brother, has consolidated power, and the revolutionary ideals have been corrupted, leading to a totalitarian state where dissent is crushed. The original leaders are either dead, erased from history, or have been co-opted into the Party's ideology, highlighting the theme of betrayal and the cyclical nature of power. Ultimately, the Revolution's leaders serve as a cautionary example of how idealism can devolve into tyranny.