Or do they comeback in their prime and healthy. Need to know details like this.

Like no point bringing Fidel, Stalin, Ho Chi Minh or Mao back to have them die soon from strokes or old age. No point having Marx or Rosa Luxembourg turn into dust.

But age they died we could get Che, Fee Hampton, Thomas Sankara, Rosa Luxembourg. Pretty much any communist martyr in their prime.

Even Lenin was relatively young and modern medicine and rehabilitation therapy might help, though he wasn't in great shape by his death.

(edit obviously if we can bring unlimited people back, we are obligated to bring back all victims of genocide, imperialism and capitalism but if we have to be strategic and only pick a handful, the we should be picking people who might help overthrow the current state of things)