Mae Deddf yr Undebau Llafur (Cymru) yn datgymhwyso’r rhannau hynny o ddeddfwriaeth newydd Llywodraeth y DU sy’n ymwneud â gosod trothwy cyffredinol o 40% o’r pleidleisiau o blaid streicio, y darpariaethau sy’n ymwneud ag amser cyfleuster yr undebau llafur, ac â’r amodau ar gyfer didynnu’r tâl ar gyfer ymaelodi ag undeb llafur o’r gyflogres.
The Trade Union (Wales) Act dis-applies aspects of new UK Government legislation that impose an overall support threshold of 40% on strike ballots, includes provisions on trade union facility time and conditions on payroll deductions for trade union membership - commonly known as check-off.