During the Labor conference on Wednesday, Barak accused the so-called "rebels," who did not attend the conference in Tel Aviv, of "character assassination."
"There are party members who are conducting themselves in an undemocratic and immoral manner. I won't succumb to the ideological dictatorship of members who do not accept authority," Barak said.
Knesset Member Eitan Cabel, one of four dissenting party members, said the authorization of the party's amended charter was "regretful" and "painful," adding "But who cares? Unfortunately, it seems that Ehud Barak doesn't.
"The convention's decision is a technical one that does not increase or decrease the issue of Labor's abandonment of its ideological values," he said.
MK Yuli Tamir told Ynet that "nothing has changed" and that the group of four would continue to act on its own accord.
Referring to the compromise reached between Barak and a number of Labor ministers that the party will hold its next primary election in October 2012, Tamir said, "Until then, it is unclear which objectives the Labor Party will serve, to which constituents it will speak and what its fundamental moral values will be."
During the heated conference, Labor Faction Chairman MK Daniel Ben-Simon told Barak, "Political leadership is built on understanding and convincing, not on charter articles. No article (in the charter) can grant moral authority if it lacks morality. Do everything in your power to promote understanding between the party members."