Income Tax Department — income tax return filing

Some indian organizations like fmpb (Friends missionary prayer band) with its headquarters at ambattur, chennai & world vision inc. With its head office at pataliputra colony in patna have a long list of employees who are getting monthly salary with pay slips and purchasing landed properties and other assets like two/four wheelers, gold and other ornaments, etc. But never bother to file income tax return at any time of the year - that too, year after year!!! Is it known to the income tax department or not? What action has income tax department taken against them till now??? Moreover, there are several cases of people earning in lakhs from private tuitions without putting up any sign board and not paying a single coin to the income tax department. Some have even quit their jobs for a better living only by tuition. When will the income tax department take action against all this??? These people are like parasites sucking away money from the govt. & the common people and they increase their rates at their own will without any control. So when will govt. Wake up from slumber and do something about this nuisance??? Instead of taking action against regular tax payers like govt. & private sector employees and threatening them of dire consequences, it is now high time for the income tax department to wake up from sleep and take action against such people who have remained hidden for long time!!!