Can't we all just get along:

Our IMC has now split into two groups. When a few of the tech members
began to have personal problems with other members of the collective,
these tech members demanded a split of the collective. The resulting
dynamics within the group continued to worsen. It created an
environment that made it difficult to continue working together and
also discouraged potential new people from joining the collective.
While most members of the collective opposed any kind of split, the
aforementioned tech members insisted that they would split anyway,
because they wanted to and because they could.

The tech members who wanted the split also had convinced the rest of
the group to agree to move the site to the linefeed.org server. They
claimed that this was merely a technical issue which would enable the
site to run faster.

The members of the splitting group also began making viscious and false
accusations about other members of the collective. This even went as
far as accusing some members of being security risks and/or police
informants.

The splitting group began to take control of the linefeed.org server
that the SF Bay Area IMC website had been hosted on by kicking off all
other IMC members from access to it. At the same time, they also cut
off access to other local activist websites (such as the Food Not Bombs
News website, liberationradio.net and passionbomb.com) that were being
hosted on their linefeed.org server. These other websites were
affiliated, to greater or lesser degrees, with members of SF Bay Area
IMC with whom the splitting group members were in conflict.

When it was clear that this internal conflict had reached a stalemate,
a neutral professional mediator was hired to conduct a series of
mediation meetings.

Hired a mediator? I think this has become a quagmire that has no way out. Call in the UN and the French.