Jedward took to Twitter yesterday to lay some heavy criticism on the series 'The X Factor' and the music industry more generally.

John and Edward Grimes became Jedward thanks to the singing competition series.

They competed in its sixth series in 2009, the same year that the likes of Olly Murs, Stacey Solomon, and Joe McElderry competed.

The twins proved hugely popular on the show, eventually finishing in sixth place.

Jedward have highlighted though that there was a lot happening behind the scenes of 'X Factor' that may not be apparent to its viewers.

They began their rant on Twitter writing: "The biggest regret in life was not telling the judges on X Factor to f*** off."

Their scathing words didn't stop there either.

Jedward went on to allege that "every contestant on the Xfactor was a slave to the show and got paid Zero while they made millions!"

They also said that "every contestant has to act like their judge mentors them! When in reality all they care about is their pay check!"

Of creator of and judge on the show Simon Cowell, they said he "thinks he’s the Mafia leader of the music industry when in reality he’s nothing but a bad facelift."

Jedward also called for justice for One Direction and Little Mix. They said: "Victims in the music industry need to be heard!"

See their tweets below.

Jedward recently appeared on 'The Late Late Show', shaving off their trademark quiffs on live TV in order to raise funds for the Irish Cancer Society.

Last week's episode of the talk show was dedicated to Daffodil Day.

The twins lost their mother, who was also their manager for many years, to cancer two years ago.