Who is Dallow from Brighton Rock and what is their importance?

Dallow is the most loyal thug in Pinkie's gang; he is Pinkie's right-hand man. At first, he seems like a simple yes-man, stroking Pinkie's ego and doing his bidding at a moment's notice. He keeps his mouth shut about Spicer's death. As time goes on and Pinkie loses control of his sanity, however, Dallow tries to become a moderating influence, attempting to convince the boy that Rose can be trusted and further killing is not necessary. At the prodding of Ida Arnold, Dallow tips off the police to Pinkie's whereabouts in order to save Rose's life. Throughout the novel, Dallow is having an affair with Judy, the wife of the blind owner of his boarding house.