  We study a class of N=1 supersymmetric U(N) gauge theories and find that
there exist vacua in which the low-energy magnetic effective gauge group
contains multiple nonabelian factors, \prod_i SU(r_i), supported by light
monopoles carrying the associated nonabelian charges. These nontrivially
generalize the physics of the so-called r-vacua found in softly broken N=2
supersymmetric SU(N) QCD, with an effective low-energy gauge group SU(r) \times
U(1)^{N-r}. The matching between classical and quantum (r_{1}, r_{2},...) vacua
gives an interesting hint about the nonabelian duality.
