Phantom Chancellor John McDonnell described Sir Winston Churchill as "bad guy" for his role in treating striking miners in Wales when he was Secretary of the Interior in 1910.
In an interview with Politico's website, Mr. McDonnell was asked, "Winston Churchill, hero or villain?"
After a moment of reflection, he replied, "Tonypandy – naughty."
He was referring to Churchill's role in a miners' strike in the village of Tonypandy in the Rhondda Valley in November 1910.
The initially peaceful strike had become more agitated after the strikers had discovered that the owners of the mine intended to bring outside workers to operate the machinery of the mine.
Local authorities asked for help at the Home Office and Churchill finally agreed to send 200 metropolitan police officers and a detachment of troops.
On the night of November 8, 1910, the situation deteriorated, resulting in battles in which a minor died and hundreds of people were injured.
In response to Mr. McDonnell's comments, Conservative MP Sir Nicholas Soames, grandson of Churchill, told the Daily Telegraph:
"Frankly, it's a very stupid and stupid thing to say, surely to gain publicity.
"I think my grandfather's reputation can withstand an attack in search of publicity from a third party, Lenin Poundland, I do not think it will shake the world."
The reputation of the British warlord has been increasingly questioned in recent years.
The best British man elected in a 2002 BBC poll was accused of being racist and misogynistic.