▁learned ▁the ▁Irish ▁language . ▁At ▁this ▁time , ▁he ▁G ael ic ised ▁his ▁name ▁from ▁John ▁Case y ▁to ▁Se án ▁Ó ▁C ath asa igh . ▁He ▁also ▁learned ▁to ▁play ▁the ▁U ille ann ▁pip es ▁and ▁was ▁a ▁founder ▁and ▁secretary ▁of ▁the ▁St . ▁Laur ence ▁O ' To ole ▁Pi pe ▁Band . ▁He ▁joined ▁the ▁Irish ▁Republican ▁Bro ther hood , ▁and ▁became ▁involved ▁in ▁the ▁Irish ▁Transport ▁and ▁General ▁Work ers ▁Union , ▁which ▁had ▁been ▁established ▁by ▁Jim ▁L ark in ▁to ▁represent ▁the ▁interests ▁of ▁the ▁un sk illed ▁labour ers ▁who ▁inhab ited ▁the ▁Dublin ▁ten ements . ▁He ▁participated ▁in ▁the ▁Dublin ▁Lock out ▁but ▁was ▁black list ed ▁and ▁could ▁not ▁find ▁steady ▁work ▁for ▁some ▁time . ▁ ▁In ▁March ▁ 1 9 1 4 , ▁he ▁became ▁General ▁Secretary ▁of ▁L ark in ' s ▁Irish ▁Cit izen ▁Army , ▁which ▁would ▁soon ▁be ▁run ▁by ▁James ▁Con n olly . ▁On ▁ 2 4 ▁July ▁ 1 9 1 4 ▁he ▁res igned ▁from ▁the ▁I CA , ▁after ▁his ▁proposal ▁to ▁den y ▁dual ▁membership ▁to ▁both ▁the ▁I CA ▁and ▁the ▁Irish ▁Vol unte ers ▁was ▁rejected . ▁ ▁One ▁of ▁his ▁first ▁sat ir ical ▁ball ads , ▁" The ▁Grand ▁O ul ' ▁D ame ▁Britann ia ", ▁was ▁published ▁in ▁The ▁Work ers ' ▁Republic ▁on ▁ 1 5 ▁January ▁ 1 9 1 6 ▁under ▁his ▁pen name ▁An ▁Gall