We present spectroscopic identification for a sample of 3LAC \(\gamma\)-ray sources, classifed as Blazars of Unknown type (BCU). The 3LAC catalogue had originally 460 BCUs out of 1591 objects. The low resolution spectroscopy was carried out using 2-4 metre class telescopes. Our selection is biased towards high Comton Dominance objects, as the initial idea was search for potential TeV-sources. All 34 observed targets have weak emission lines and the one (?) low redshift object shows only absorption lines of the host galaxy. Our
This is the abstract section. The abstract should be one section and count less than 200 words.