  Radio-Loud (RL) Active Galactic Nuclei (AGNs) are among the brightest
astrophysical sources at all wavelengths. Their relativistic jets can affect
both their Supermassive Black Holes (SMBHs) growth and the surrounding
intergalactic medium. While in the radio band these jets can be observed at all
scales (from pc to Mpc scales), their X-ray and {\gamma}-ray emission is
expected to be concentrated on very small scales (<10 pc). However, after the
launch of the Chandra X-ray telescope, several kpc-scale jets were detected and
the mechanism responsible for their high-energy radiation at these scales is
still under debate. Understanding its origin is crucial also to derive the
physical properties of these jets (e.g. the power) at large scales and, as a
consequence, their impact on the environment. In the following, we explore the
Inverse Compton interaction of the relativistic electrons within relativistic
jets with the Cosmic Microwave background photons (IC/CMB) as possible
interpretation. Moreover, we also estimate how this interpretation could also
affect the observed evolution across cosmic times of the SMBHs hosted in jetted
systems.
