ISKCON are some of the more militant Hindus, only when it comes to their faith and dietary habbits, of course. They are proper staunch believers of the dharm.
Their founder Srila Prabhupada was pretty hardcore too, quick to temper.
As far as I know their operations are mostly based outside of India, and they are a rarity in that they actually propagate the faith, proselytize with a Dharmi twist.
Waay back in the day, I found a contact inside Delhi ISCON temple, French gora priest in all safforn with a 'bodi' ponytale. He's sell Gitas at a busy crossing all day, lots would buy them too.. it was a novelty seeing this young gora under a busy flyover crossing in the sweltering heat, hash dealer by night