What do you mean by a 'true attempts'?
Though I mentioned the democracies the US First Amendment is a wonderful thing which helps keep free speech free. Every country should have it. Nonetheless there have been attempts.
And these are the leaders of tomorrow.
Free Speech: Campus Hate Speech Codes
You probably mean Islamic nations. I don't know of anyone who has been charged under blasphemy laws in any Christian dominated country.
These laws against free speech, or hate speech laws can be misused greatly. Look at the reasons above for limiting free speech "False facts, Flawed argumentation, Divisive language, Dehumanizing metaphors". We can easily see where this can lead if hate speech laws are ever implemented.