  In this paper we discuss symmetry breaking in string theory. Spacetime
symmetries are implemented as inner automorphisms of the underlying
superconformal algebra. Conserved currents generate unbroken spacetime
symmetries. As we deform the classical solutions of the string equations of
motion, the deformed currents continue to generate spontaneously broken
symmetries even though they cease to commute with the string Hamiltonian. We
illustrate these ideas by studying supersymmetry breaking in a non-trivial
string background.
