  Near-horizon geometry of coincident M2-branes at a conical singularity is
related to M-theory on AdS4 times an appropriate seven-dimensional manifold X7.
For X_7=N^{0,1,0}, squashing deformation is known to lead to spontaneous
(super) symmetry breaking from N=(3, 0) to N=(0, 1) in gauged AdS4
supergravity. Via AdS/CFT correspondence, it is interpreted as renormalization
group flow of strongly coupled three-dimensional field theory with SU(3)*SU(2)
global symmetry. The flow interpolates between N=(0,1) fixed point in the UV to
N=(3,0)fixed point in the IR. Evidences for the interpretation are found both
from critical points of the supergravity scalar potential and from conformal
dimension of relevant chiral primary operators at each fixed point. We also
analyze cases with X7=SO(5)/SO(3)_{max}, V_{5,2}(R), M^{1,1,1}, Q^{1,1,1} and
find that there is no nontrivial renormalization group flows. We extend the
analysis to Englert type vacua of M-theory. By analyzing de Wit-Nicolai
potential, we find that deformation of S7 gives rise to renormalization group
flow from N=8, SO(8) invariant UV fixed point to N=1, G_2 invariant IR fixed
point. For AdS_7 supergravity relevant for near-horizon geometry of coincident
M5-branes, we also point out a nontrivial renormalization group flow from N=1
superconformal UV fixed point to non-supersymmetric IR fixed point.
