It depends on the state. My state is a one party state, meaning any person that is party to a private conversation can legally reveal everything in it to the public.
On paper, whistleblowers have federal protection from prosecution. In reality, however, if you blow the whistle on a rich person, a corporation, or the government, the government will go out of its way to punish you and make an example. See Edward Snowden, who is still wanted by the government, despite having revealed the government was engaged in what was then highly illegal espionage against their own citizens. The government responded by making that invasion of privacy legal.
It depends on the state. My state is a one party state, meaning any person that is party to a private conversation can legally reveal everything in it to the public.
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On paper, whistleblowers have federal protection from prosecution. In reality, however, if you blow the whistle on a rich person, a corporation, or the government, the government will go out of its way to punish you and make an example. See Edward Snowden, who is still wanted by the government, despite having revealed the government was engaged in what was then highly illegal espionage against their own citizens. The government responded by making that invasion of privacy legal.