I remember as a kid they used to say what the offense was then later they started saying that "so and so" was df'd for acts unbecoming of a Christian and is no longer considered a good associate.
Everyone in the congregation eventually found out what the details were because let's face it....the power of the Holy Spirit is limited to how scrupulous the Elders on the Committee (and their Wives) are, and whether their giant book bags have locks on them.