Brick kilns in violation of rules

Another case of people getting away with grave environmental crime has come to light in Sitakund where four brick kilns have been operation for the last decade in violation of rules on many counts. We call it a grievous offense because these kilns, which emit toxic gases, are situated very close to the fringes of a reserve forest causing great harm to the trees. And trees provide us the basic sustenance for living, oxygen. And for an occasional fine the authorities, from the DC to the department of environment, have been unable, or unwilling, to stop these harmful kilns.  
The interesting aspect of the matter is that people in position of authority are all aware of the existence of these illegal kilns, which not only do not have valid license, but exist in violation of the rule that requires kilns to be at least three kilometer radius away from a reserve forest.
We have several questions in this regard. Firstly, how could such kilns start operating without valid license and relevant clearance at all? Secondly, how come legal procedures against the errant owners were initiated only in 2011 when at least three of them had been operating for nearly ten years? And should the relevant department not be more proactive to move the court for quick orders given the importance of the matter?
We are constrained to say that there is collusion between the defaulting factory owners and the agencies concerned. And not only the errant owners but also the errant persons whose job it is to exercise oversight in these matters be taken to task for dereliction of duty.