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With bolometric luminosities exceeding 10⁴⁸ erg s⁻¹, powerful jets and supermassive black holes at their center, MeV blazars are some of the most extreme sources in the Universe. Recently, the Fermi-Large Area Telescope detected five new γ-ray emitting MeV blazars beyond redshift z=3.1. With the goal of precisely characterizing the jet properties of these extreme sources, we started a multiwavelength campaign to follow them up with joint NuSTAR, Swift and SARA observations. We observe sixdoi:10.13016/m24tyn-b9ik fatcat:4mxhfcqbe5hojaxzsn577vxufy