No One Told Achav
Achav's idol-worshipping generation won its wars because it had no informers: no one told the king that Ovadiah was hiding the prophets.
The Midrash makes a startling observation. The generation of Achav served idols, yet they went out to war and won. Rav Shmuel bar Nachman explained that there were no informers among them. When Izevel sought to kill the prophets of Hashem and Ovadiah hid a hundred of them in caves, not one person went to Achav to say, Ovadiah has done such and such. The generation of Shaul HaMelech was different. When Shaul pursued Dovid, people ran to the king with reports about him, as Doeg the Edomite and the men of Zif did, and so they fell in battle. The Midrash continues that malicious speech drives the Shechinah away from the world, and kills three: the one who speaks it, the one who accepts it, and the one it is spoken about.
Source: Midrash Devarim Rabbah 5:10, Shoftim (on Melachim I 18:13)
A whole generation was protected because no one carried a report to the king. This week, when you hear something that could hurt someone if it were passed on, let it stop with you. If you feel the pull to share, say quietly, this is not mine to tell. And if someone brings you a report about another person, gently change the subject. One guarded conversation can protect more people than you know.