  Dynamical mechanisms are essential to exchange angular momentum in galaxies,
drive the gas to the center, and fuel the central super-massive black holes.
While at 100pc scale, the gas is sometimes stalled in nuclear rings, recent
observations reaching 10pc scale have revealed, within the sphere of influence
of the black hole, smoking gun evidence of fueling. Observations of AGN
feedback are described, together with the suspected responsible mechanisms.
Molecular outflows are frequently detected in active galaxies with ALMA and
NOEMA, with loading factors between 1 and 5. When driven by AGN with escape
velocity, these outflows are therefore a clear way to moderate or suppress star
formation. Molecular disks, or tori, are detected at 10pc-scale, kinematically
decoupled from their host disk, with random orientation. They can be used to
measure the black hole mass.
