As I belong to North India (U.P. to be precise), I have no link in Kerala. But I don't still beleive that they beaten your freind Sameer only because he went to a shakha. Not possible at all. There should be some other matter. Please ask him to contact a senior (I mean old) RSS worker at his locality and talk with him If he has any grievence still not resolved, he is free ot write to RSS chief Sh. K.C. Sudarshan ji at his Nagpur address (just right RSS head qtrs, Nagpur in address). He will definitely reply.
