Is that the outfit associated with Root and Branch? If so, they're very controversial. Are they the ones who Orthodox rabbis are calling the "Insanehedrin?"
Unfortunately, I believe this is the Case.
R&B is strange. In one breath they demand the restitution of the Biblical sacrificial service, contrary to all the inanities of modern thought. But then they sponsor talks by uncoverted moslems and chr*stians (and by members of an outfit called the Transnational Radical Party) and have radical, higher-critical chr*stians like Hans Kung on their board of advisors. Can you think of anything that makes less sense than a radical leftist "higher critical" Catholic serving as an advisor to an organization that advocates the restitution of Biblical sacrifices???
But despite everything, the real Sanhedrion will be reestablished when G-d wills. May this happen immediately!
It's funny -- when I google the term "insanehedrin", there are only nine reference that show up. Only one of them is from 2005 on Free Republic, and it's by you.
I don't think that this neologism is in common uage by any stretch of the imagination. Those members of the Sanhedrin of today who have been identified are leading Orthodox Rabbis, not part of any fringe group of Judaism. Some of them, such as Rabbi Adin Steinsaltz, are full participants in the "modern" world, despite being quite observant.