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Relativistic jets are one of the most powerful manifestations of the releaseof energy produced around supermassive black holes at the centre of activegalactic nuclei (AGN). Their emission is observed across the entireelectromagnetic spectrum, from the radio band to gamma rays. Despite decades ofefforts, many aspects of the physics of relativistic jets remain elusive. Inparticular, the location and the mechanisms responsible for the high-energyemission and the connection of the variability at different wavelengths areamong the greatest challenges in the study of AGN. From the comparison of theradio and gamma-ray light curves of gamma-ray flaring objects, there isevidence that some flares, either in radio or in gamma rays, have not anobvious connection at the other extreme of the electromagnetic spectrum, likein the case of the Narrow-Line Seyfert 1 SBS 0846+513. An intriguing aspectpointed out by high resolution radio observations is the change of thepolarization properties close in time with some high energy flares. Inparticular, in PKS 1510-089 and 3C 454.3 a rotation of almost 90 degrees hasbeen observed after strong gamma-ray flares. The swing of the polarizationangle may be related either to the propagation of a shock along the jet thatorders the magnetic field, or a change of the opacity regime.

On the connection between radio and gamma rays. Variability and polarization properties in relativistic jets