Is there any problem with putting someone in their place? Let's say there is a person who is not truthful in their day to day activity, is a hypocrite, does things to fool people in order to get financial gain. And many people are really indeed fooled by such a person. Is there anything wrong with calling this person out and saying that perhaps what they're doing is wrong? Especially if their actions are sometimes against the Torah or what Chazal said, for example, if they ask for tzedeka although they are really not worthy.
I would say to tell other people would be lashon hara or perhaps motzei shem rah. However what about to address the person himself?
(Any sources one way or another would be helpful.)