Although I'm a native Hindu from India, my knowledge of Hinduism is confined to Mahabharata, Ramayana and few mantras from Upanishads.
I want to know if there are references to yantras in Puranas, Ithihasas, Vedas, Upanishads, etc which allows one to know thoughts of others and also influence thoughts of others through those yantras. If yes, what were such yantras called and what protections were recommended against them?
What crime would the people or person who used such yantras to know the thoughts of others be guilty of?
What crime would the people or person who used such yantras to influence the thoughts of others be guilty of?
What punishment is recommended for people who use yantras to know and/or influence thoughts of others? What karma will they suffer?
I in think such technology has been in existence since 1960s. I can show links for such if required.