  We introduce a notion of a Fox pairing in a group algebra and use Fox
pairings to define automorphisms of the Malcev completions of groups. These
automorphisms generalize to the algebraic setting the action of the Dehn twists
in the group algebras of the fundamental groups of surfaces. This work is
inspired by the Kawazumi-Kuno generalization of the Dehn twists to non-simple
closed curves on surfaces.
