He claimed he was defending the Jewish community.
The allegations against Mitula were based on information gathered by the anti-racism group Hope Not Hate, apparently from his X account, which he has now deleted.
Mitula said: “I’m confirming my suspension as a Reform member pending investigation.
“The comments in question were taken out of context, and actually defended the Jewish community.”
He added later he had “no comment” to make on the racial slur he used in relation to black people.
Reform UK said: “With regard to Adam Mitula, our disciplinary process is confidential and we do not provide a running commentary on any potential cases that are being considered.”
There are more than 76,000 potential voters in the Gorton and Denton by-election spread across Denton in Tameside, and Gorton, Levenshulme and Burnage in Manchester.
A full list of the candidates and their minute manifestos can be found here.