<span>The organization known as Books through Bars was aimed to help the prisoners who wanted to have access to books but couldn't because they were in prison and were not given the access to read. Prisoners send them letters requesting books and they respond by sending the books.
</span>
The hyphen in "one-time winner" is used because one and time modify winner.
Those two words both describe the word winner, which is why it is necessary to hyphen them in order to sort of make one single word out of those two. One-time, when hyphenated, is an adjective used to modify the noun following it.