An average of more than two academies per week in England are facing formal interventions because of poor performance.
The figures have been released by ministers in response to a question by the Liberal Democrats.
In the past year, 66 academies have been moved to another chain and 50 have been given warning notices to improve.
The Department for Education says academies have been at the centre of improvements in standards.
But Liberal Democrat leader Tim Farron says it is "evidence that the government is putting dogma first".…