As the preamble of the instant Act shows the three purposes, to achieve which it has been enacted are the same as those under the earlier enactment, the Madras Act XXV of 1949, namely, (1) the regulation of letting of residential and non residential buildings, (2) the control of rents of such buildings, and (3) the prevention of unreasonable eviction of tenants from such buildings, except that the enactment is of a comprehensive nature by way of amending and consolidating the rent control law obtaining in the State till then Unquestionably it is a piece of beneficial legislation intended to remedy the two evils of rack renting (exaction of exhorbitant rents) and unreasonable eviction generated by large scale of influx of population to big cities and urban areas in the post Second World War period creating acute shortage of accommodation in such areas and the enactment avowedly protects the rights of tenants in occupation of buildings in such areas from being charged unreasonable rents and from being unreasonably evicted therefore; it further protects their possession even after the determination of their contractual tenancies by enlarging the definition of a 'tenant ' so as to include persons who have held over after such determination.