Gangs are marked by fraternal feeling, and narrow cliques by intense loyalty to their own codes.
The sociology professor struck a responsive chord in us: for since our earliest years we had wigwagged to each other as Boy Scouts, learned the finger alphabet of the deaf and dumb so that we might maintain communication during school hours, strung a telegraph wire between our two homes, admired Poe's "Gold Bug" together and devised boyish cipher codes in which to send each other postcards when chance separated us.