Pubcos were slated for their treatment of tenants on BBC's Inside Out programme on Monday night.
Peter Luff MP pulled no punches, referring to the "culture of bullying, intimidation [and] threat" by some pubcos and said it was "clearly wrong" that they get the "lion's share" of profits from pubs.
He also spoke of the "continual stream of suckers" wanting to take on pubs.
The show was broadcast in London and featured lessee of two tied pubs in the capital.
Fair Pint campaigner and Enterprise lessee Simon Clarke earned about £40, and business partner David Law the same, when the Eagle in Clapham took £1,000 in a night. Enterprise takes £600, the show said.
Clarke earns £3.85 per hour overall and Jeff Gitter of Lubbock Fine Accountants said it was "impossible to make a living".
In addition, an "independent arbitrator" ruled the pub's rent was £17,000 too high.
Enterprise said the lease gave a discount on the brewers' list prices and Clarke's claims about the prices they paid for beer were "untrue".
Also featured were departing Admiral lessees Steve and Cheryl Morton, of the Anchor and Hope, who were "driven to near bankruptcy" when they faced a 240% rent hike.
Steve said he was told if he didn't accept a £12,300 increase, his BDM would recommend a £14,000 rise.
Admiral said: "We are satisfied with the actions of our employees and representatives, and dispute any suggestion of inappropriateness."