A man consumed a bottle of whisky then sent a voicemail message that he wanted to kill Jeremy Corbyn, saying he was the leader of the Liberal Democrats.
Jobless Samuel Naylor, 37, made the call to the Brexit Party and also demanded an end to leaflet deliveries to his Eastwood home.
Details were given to city magistrates where he admitted sending a voicemail on November 17 to cause distress or anxiety.
Paul McLeod, mitigating, told the court : "This is bizarre.
"In terms of Jeremy Corbyn, everybody in this court knows about Jeremy Corbyn and which party he is affiliated to.
"Here he is saying it was the Liberal Democrats. He got it wrong, got the party wrong.
"He is not affiliated to any party, he is not politically active."
Mr McLeod said the call was made shortly after 12midnight when Naylor had downed a bottle of whisky in 90 seconds.
He said the voicemail was passed immediately to police officers and went on: "No person suffered alarm or distress or anxiety.
"This is one drunken rant from someone with no political alliances."
He said Naylor is "suffering from alcoholism" and receives no state benefits. He last worked in his father's shop.
A four-week prison term, suspended for a year, was imposed on Naylor, of Nottingham Road, Eastwood. He must pay £207 costs.
Presiding magistrate Roger Clay, who sat with two colleagues, said they noted Naylor's criminal record.
He added: "You have a history of violence against the person. You called the Brexit Party and threatened to kill Mr Corbyn."
Anthony Cheung, prosecuting, played a tape of the message in court where a voice can be heard saying: "Jeremy Corbyn, I am going to kill him."
The message was discovered when staff arrived at Brexit HQ. They described it as "an aggressive male, obscene".
When questioned, Naylor said it was the anniversary of his mother's death and he had been drinking.
Mr Cheung told the court: "He said that he had no political stance and that Jeremy Corbyn was the leader of the Lib Dems."
Outside court, Naylor was asked to comment on the case. His father said: "Happy New Year."
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