Rangers, Blackburn, Birmingham City, there's quite a few notable shouts.
My vote goes to Coventry City. SISU, the group that own the club, are publicly strangling the life out of the club and the local council. SISU are pretty shady, funded by 'unnamed sources' believed to be from the Cayman Islands. No one knows who are actually behind the group. They also seem to only care for finances and not what's good for the club. SISU deliberately stopped paying rent to Coventry City Council for the Ricoh Arena in early 2012, and so the club had to surrender the stadium and move 35 miles to Northampton's ground to play matches. Even when the Council offered SISU free rent and asked them to only pay matchday costs such as food sales and car parking, SISU refused. They want the stadium, the ownership and the land, but don't want to hand over a penny to do so.
It's believed that SISU stopped paying the rent for the Ricoh Arena to plunge the Council into financial distress, and then get the stadium on the cheap. It's an embarrassment that these kind of groups are part of the Football League. If the club continues the way it is, it won't exist in a few years.