  We study nonabelian vortices (flux tubes) in SU(N) gauge theories, which are
responsible for the confinement of (nonabelian) magnetic monopoles. In
particular a detailed analysis is given of ${\cal N}=2$ SQCD with gauge group
SU(3) deformed by a small adjoint chiral multiplet mass. Tuning the bare quark
masses (which we take to be large) to a common value $m$, we consider a
particular vacuum of this theory in which an SU(2) subgroup of the gauge group
remains unbroken. We consider $5 \ge N_f \ge 4$ flavors so that the SU(2)
sub-sector remains non asymptotically free: the vortices carrying nonabelian
fluxes may be reliably studied in a semi-classical regime. We show that the
vortices indeed acquire exact zero modes which generate global rotations of the
flux in an $SU(2)_{C+F}$ group. We study an effective world-sheet theory of
these orientational zero modes which reduces to an ${\cal N}=2$ O(3) sigma
model in (1+1) dimensions. Mirror symmetry then teaches us that the dual SU(2)
group is not dynamically broken.
