Chofetz Chaim Daily 15 Cheshvan 4:9 If you see someone has bad middos, you may not badmouth him because he probably doesn’t realize the severity of his actions. Instead, influence him to change. 4:10 You may tell your children or students to stay away from a person with bad middos. However, you must explain why you are telling them.
Chofetz Chaim Daily 13 Cheshvan4:5 If the person you saw doing the aveira isn’t wholesome, won’t accept your rebuke & is likely to repeat the sin, you may tell someone who can influence him to repent. If two people saw, they may tell Beis Din to rebuke him. 4:6 You may tell that influencer, even if he may leak info