Anantapur, May 11: Hundreds of unregistered granite and slab industries have been evading taxes in Tadipatri in Anantapur district for some years.

There are about 200 granite and 1,500 slab industries in Tadipatri, of which 61 are granite and 632 slab industries are unregistered. But these industries are operating by flouting norms with officials support.