Jeremy Corbyn has new troubles to deal with as he faces a potential mutiny over the decision to suspend - rather than expel - Ken Livingstone from the Labour Party.
The panel ruled the former London Mayor had brought the party in disrepute, but was only suspended from the party for a year.
While he is not allowed to campaign for office to represent Labour, he can still attend party meetings and vote.
The ruling has drawn heavy criticism from Jewish groups, and in particular, from Labour MPs, including some of the party's most senior figures.
Deputy leader Tom Watson says the ruling "shames us all" and has left him "saddened", while former leadership candidate Yvette Cooper adopted similar language, saying the failure to banish Livingstone was "shameful".
Wes Streeting, Labour MP for Ilford North, said on Twitter: "So much for a zero tolerance approach to anti-Semitism. This is a betrayal of Jewish Labour supporters and their values."
Shadow Health Secretary Jonathan Ashworth said he "can't understand" the verdict, suggesting that Labour's National Executive Committee had agreed to a zero-tolerance approach to anti-semitism during his time as a member.