(Top) WISE color–color diagram of 148 HSC–FIRST RGs with S/N > 3 in 3.4, 4.6, and 12 μm. Blue and red circles are SDSS- and HSC-level RGs, respectively. Yellow and green circles are SDSS-detected FIRST FR I and FR II RGs with r < 17.8 mag, respectively, that are obtained from Capetti et al. (2017a, 2017b). Regions with different color shading show typical MIR colors of different populations of objects (Wright et al. 2010). The solid lines illustrate the AGN selection wedge defined from Mateos et al. (2012, 2013). (Bottom) Histogram of rest-frame 1.4 GHz luminosity (L_{1.4 GHz}) and rest-frame radio-loudness (R_rest) for objects inside (magenta) and outside (black) of the AGN wedge. The mean values are shown in dashed lines.