Chafetz Chaim, Part One, The Prohibition Against Lashon Hara, Principle 4
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כְּשֶׁבֵּית דִּין (לג) אוֹמְרִים לְאָדָם דִּין אֶחָד בְּמַה שֶּׁהוּא (לד) בְּקוּם וַעֲשֵׂה, בֵּין שֶׁהוּא דְּבָרִים שֶׁבֵּין אָדָם לַמָּקוֹם אוֹ דְּבָרִים שֶׁבֵּין אָדָם לַחֲבֵרוֹ, וְאֵינוֹ רוֹצֶּה לְקַיֵּם בְּשׁוּם אֹפֶן, וְאֵין לוֹ תְּשׁוּבָה בְּמַה שֶּׁאֵינוֹ מְקַיֵּם, מֻתָּר לְסַפֵּר גְּנוּתוֹ וְאַף לִרְשֹׁם אֶת גְּנוּתוֹ בְּסֵפֶר הַזִּכְרוֹנוֹת לְדוֹר דּוֹרִים. וְאִם הֵשִׁיב תְּשׁוּבָה בַּאֲמַתְלָאוֹת, שֶׁתָּלוּי לְפִי דָּבָר הַמָּסוּר לַלֵּב, דִּינוֹ כָּךְ, אִם אָנוּ מְבִינִים שֶׁהַתְּשׁוּבָה זוֹ אֵינֶנָּה אֱמֶת רַק לְהוֹצִיא מִדַּעְתֵּנוּ, אֵין אָנוּ צְּרִיכִין לְהַאֲמִינוֹ (לה) וּמִתָּר לְסַפֵּר בִּגְנוּתוֹ וְאַף לִרְשֹׁם כַּנַּ"ל, אֲבָל אִם הַדָּבָר סָפֵק, אָסוּר לְסַפֵּר בִּגְנוּתוֹ.
When beth-din tell a man a certain din involving a positive commandment, whether in the area of between "man and his Maker" or in that of "between man and his neighbor," and he absolutely refuses to fulfill it and has no rationale for his refusal, it is permitted to speak demeaningly of him and even to record his refractoriness in the registry for all the generations [to see]. And if he attempts to excuse his behavior, his din is as follows: If we understand that what he says is not true, but merely an attempt to push us off, we need not believe him, and we may demean him and even record his taint, as mentioned above. But if there is some doubt, it is forbidden to speak demeaningly of him.