George Orwell noticed this about the left; they don't like the poor, they simply hate the rich.
Orwell was a socialist, but came to the realization that Stalin was a murderous monster and that the Cheka/NKVD/KGB was Stalin's tool for oppression and slaughter.
Leftist revolution eat their own, without regard to age or service to the revolution. Taking and keeping power and exacting revenge ensures that will happen.