They suffered a severe split over participation in the wartime government of national unity.
It has suffered a severe split despite previous promises to stand united against a Government that it denounces as a military dictatorship.
But the vote revealed a severe split in the party that might be hard to patch up.
The result was a severe split in the very small sculpture world of the time, the repercussions of which are still felt today.
Socialist Challenge underwent a severe split in 1994 when Barry Weisleder, the editor of the newspaper, was expelled.
Observers say this is the most severe split to date within the community.
Following a severe split in its ranks last summer, most of its 5,000 or so followers have defected to the Government.
But if it looked like a severe Shiite split might take place, the ayatollah could step in and force the parties to make peace.
In 1983, the party suffered a severe split.
The conservative turn caused a severe split in the membership.