Thiruvananthapuram: VS Achuthanandan, former Chief Minister and veteran CPI (M) leader demanded Maradu flat builders who duped the consumers to have included in the blacklist. Achuthanandan asked to take legal action against those who have given permission to build flats. Supreme Court verdict on Maradu flats were based on legal system in the nation. Whenever such construction works occur by violating laws, and being pointed out over the legal violation, the building owners approach the court and bag stay to continue the construction work. These building owners sell the flats to elite personalities free of cost and use their celebrity status to sell the flats. VS said there are many builders pursuing the way as a maneuver to sell the flats.