ˈɔːlsoʊ ɪn tˈuː θˈaʊzənd sˈɪks, ɡæbˈɛli fˈeɪsd ɐ sˈɪvəl ɪnvˌɛstɪɡˈeɪʃən fɹʌmðə jˈuː.ˈɛs. dᵻpˈɑːɹtmənt ʌv dʒˈʌstɪs æz tə wˈɛðɚ hiː pˈɜːpəsfəli dᵻsˈiːvd ðɪ ˌɛfsˌiːsˈiː wɛn bˈɪdɪŋ tə pˈɜːtʃɪs sˈɛɡmənts ʌvðə wˈaɪɚləs spˈɛktɹəm.
Also in 2006, Gabelli faced a civil investigation from the U.S. Department of Justice as to whether he purposefully deceived the FCC when bidding to purchase segments of the wireless spectrum.