You cannot use heartland institute as a source. If the claim is that it is leftwing because they are supported by the working class than the republican party is leftwing/socialist which is hard to take seriously.
As for your question the easiest and clearest example would be Augusto José Ramón Pinochet Ugarte of Chile that was supported by the right wing forces in the US, including Milton Friedman.
I would encourage you to look aside from your partisan lenses. Note that I do not in any way argue against that Stalin or Mao most likely should be considered left wing and were brutal authoritarians that was a stain on the world.
As for your question the easiest and clearest example would be Augusto José Ramón Pinochet Ugarte of Chile that was supported by the right wing forces in the US, including Milton Friedman.
I would encourage you to look aside from your partisan lenses. Note that I do not in any way argue against that Stalin or Mao most likely should be considered left wing and were brutal authoritarians that was a stain on the world.