I heard of them as historical victims who were warriors of science or something. I know the the hhird one got a movie about her which I've never seen.
What I've read of them points to propaganda on both sides. Who are the best researchers to read to learn about those three, what they stood for, and how their relations with their lands' authorities (be they secular or divine) were like?
For a one-stop overview of how historians of science view these, check out Ronald Numbers, ed., Galileo Goes to Jail and Other Myths about Science and Religion (Harvard University Press, 2010). Numbers is a very well-respected historian of science and religion; the authors in the book are all serious historians of science who are not grinding any axes in the modern science/religion debates. The first essay talks about Hypatia, Bruno is in essay 7, and Galileo is essay 8. Plus much more!
The basic academic history of science take on these is that none of these individual cases should be seen as representative of some larger theme of "the war between science and religion," and reducing them to "warriors for science" misunderstands their cases a lot.