http://www.e-reading.club/bookreader.php/107333/Vzryvnoii_udar_i_aktivnaya_oborona.pdf

A classic text all-round.
The fifth section of the book, 'Differences between Fist-Fighting and Boxing' (page 7) is my favourite.
Dempsey was famous as a boxer, but also had a history as an experienced street fighter and challenge fighter.
He lived life rough on the roads, and experienced poverty, danger and hardship.
He was intense, determined and ruthless in the ring; as evidenced by round one of the fight below.
Some claim he may have 'doctored' his hand wraps or gloves in some way before this fight (a report described Willard, 'One of his cheekbones had caved in. His jaw was broken, as was his nose. His ribs were busted. Many of his teeth had been knocked out…').
Whether he did or didn't 'cheat', he left a lasting impression on the world, and was a great inspiration of a later, vicious destroyer, Mike Tyson.

Both Dempsey and Tyson (like many boxers) came from the street, from the gutter.
They clawed their ways up, and did whatever it took to survive and succeed.

Life, unlike boxing, has no rule book....