It's to show an exception (which is often the purpose of "yet") because in the first clause it identifies an action, then then it's like "but wait, maybe the action didn't really get going" in the second half of the sentence
It suggests that Americans are in danger of losing their rights.
It predicts that the enemy will try to take away free speech.
It implies that the US will lose the war if Americans do not buy war bonds.
Answer:
we are answering all of this question and you are giving us only 5 pts not fair
