Looks like somebody has threatened the moderators of the Park Slope Parents Yahoo Group with a lawsuit related to something that a member posted.
They have shut down the Message Archives until further notice, and are seeking an “expert in Internet law” to help:
“The PSP Moderators and Advisory Committee have already spent hundreds of hours trying to resolve this situation. It is important that we resolve this quickly and with integrity — if we do not, the entire PSP list may be in jeopardy and may have to be closed down entirely…”