In the past two years the number of penalties City have been awarded at the Etihad Stadium has been the subject of debate.
Roberto Mancini’s side have been given 21 spot-kicks since the start of 2010-11.
And, ahead of his United's visit to City on Sunday, Ferguson has raised the spot-kick issue.
"The number of penalty kicks they get - 21 in the last year or something like that," said Ferguson.
"If we got that number of penalty kicks there'd be an inquiry in the House of Commons. There'd be a protest."
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