The truth is an absolute defense to defamation. However, there is no way to protect yourself, if the person or entity you are defaming, disagrees with your interpretation of the facts. There is always a risk associated with an attempt to inform the public about the alleged bad acts of others. There is no way to absolutely protect yourself, other than to refrain from action in the first place.
That said, if you believe that an organization is engaged in some sort of fraud, then you may want to complain to the county district attorney or state attorney general.
Hope this helps.
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