I would assume you're speaking of McCarthyism and his search for Communists, in which case I would say the term is blacklisting, but I'm not certain.
McCarthyism
Ruthless is an adjective.
"No Quarter Given" means to show no mercy or offer no surrender to opponents, typically in a conflict or battle. It signifies a ruthless or unforgiving approach and implies that no mercy will be shown.
Yes, the term 'more ruthless' is the comparative form of the adjective 'ruthless'. The superlative form is 'most ruthless'.
sam was a really ruthless child
Ruthless Order was created in 2006.
Ruthless for Life was created in 1997.
the cops just captured a ruthless killer
The duration of The Ruthless Four is 1.67 hours.
The duration of Ruthless People is 1.55 hours.
Yes. Hitler was ruthless and immoral.
Ruthless Records was created on 1987-03-03.