Chiefly it prevents the use of agency workers during strike action in services that belong to the public sector, as well as overturning a 40% support threshold for strike ballots, restrictions affecting time off for union activities and the taking of union subscriptions directly from pay packets.

[2] At the time it was approved in July 2017, Mark Drakeford, Cabinet Secretary for Finance praised the Act as "a very significant day" for public services and devolution.

[2] The Welsh branch of the GMB trade union said that it would fight plans to overturn Senedd legislation, with its political officer Tom Hoyles accusing the UK government of "overstepping the mark", while the Welsh Government described them as "counter-productive and against everything we stand for in Wales" and said they would "resist" plans to overturn the Act.

Rhianon Passmore a Labour Member of the Senedd, described it as "an attack on Welsh workers", while Plaid Cymru economics spokesman Luke Fletcher called it a "power grab".

However, BBC News reported that the 2017 law had been passed before changes to the Senedd's powers had made it clear that industrial relations is a "reserved" matter for Westminster.