When referring to both groups, I commonly use “neo-liberal” but similar to what knfrmity said, only communists will know it’s derogatory. I’m also warming up to “neo-feudalist”.

Anticommunist.

Literally speaking, liberal. But nobody except a communist would get it.

If your looking for one that would be the most effective for actually convincing regular people probably Imperialist.

Capitalist

I’m glad I was never subjected to whatever mental gymnastics are in Arendt’s horseshoe theory polemic.