Is there a way to flag users? This is the umpteenth time that this user (known) has literally copy pasted the same responses every time any article with India

Is there a way to flag users? This is the umpteenth time that this user (known) has literally copy pasted the same responses every time any article with India as a focus comes up on HN .. caste this, less than $1 that, etc etc. Wish there was a way to ban trolls ..