They fought for 'freedom of speech'. = They fought for the right to/of 'free speech'. [=they fought for the legal right to express their opinions freely]
He kept revising his 'speech' [=the words that he had written for his speech] right up until the last minute.
She thanked us in her 'acceptance speech'. [=a speech given by someone receiving an award or prize]
(..) A message. Ultron killed Strucker. And he did a Banksy at the crime scene, just for us. This is a smokescreen. Why send a message when you've just given a speech? Strucker knew something that Ultron wanted us to miss. Yeah, I bet he... ...yep. Everything we had on Strucker has been erased. (..)2015 Avengers: Age of Ultron