In this video interview (at 8m25) Herb Block explains how he cointed the famous terms, "McCarthyism".
"Yea [I invented McCarthyism], apparently so. That's the first use made of that word that I know of. I remember how it originated, because they wanted to put something on that top barrel, and you couldn't call it McCarthy himself, and you wouldn't say 'McCarthy techniques" or so on. I thought well we could maybe use just one word, "McCarthyism". And it caught on."Video in full here.