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Since 2008 the Fermi/LAT instrument has delivered highly time-resolvedgamma-ray spectra and detailed variability curves for a steadily increasingnumber of AGN. For detailed AGN studies the Fermi/LAT data have to be combinedwith, and accompanied by, dedicated ground- and space-based multi-frequencyobservations. In this framework, the Fermi AGN team has realized a detailedplan for multi-wavelength campaigns including a large suite of cm/mm/sub-mmband instruments. Many of those campaigns have been triggered, often forsources detected in flaring states. We review here a few interesting resultsrecently obtained during three such campaigns, namely for the flat-spectrumradio quasar 3C 279, the Narrow Line Seyfert 1 PMN J0948+0022 and quasar 3C454.3.

Recent multi-wavelength campaigns in the Fermi-GST era