Communists and Socialists have faced struggles with color revolutions and counterrevolutions, and have met those struggles with force, yes. However, it's worth engaging with what the counter revolutionaries wanted. Well, they succeeded in the 1990s with the dissolution of the USSR, and what happened next was a collapse in life expectancy and 7 million excess deaths. Dissent is allowed in Socialist countries, what isn't allowed is the Bourgeoisie acting freely and inciting violence against the people.
Further, your comment was hardly "dissent," it was you insulting me without engaging with the arguments. It's toothless. It's unfortunate that you don't live up to your username, fascism and anticommunism are twins.