Thread:Comments:Thousands take to streets protesting 'ratbag's Bedroom Tax/Jeez./reply (13)

Is there some connection between the lable "ratbag" and the tax? The definition, for those of us who have not had a chance to chase down rats refers to what "rat catchers" used  "who carried a 'rat bag'." So is Harry saying that Iain Duncan Smith is a person of multiple personalities, all of whom are rats, or that he represents a bunch of rats? Its hard for foriengers to get the meaning clearly...