It's over recent Census results, which showed a decline in the number of Welsh speakers.
The Welsh Government say the building remains open to staff and visitors as usual.
Cymdeithas are holding a peaceful protest at one of the entrances at the Welsh Government offices in Cardiff. The main reception remains open as usual to all staff and visitors.
More top news
A mystery tree vandal has struck again in Swansea. The council has issued an appeal for information after a tree was cut with a handsaw.
If you bought a lottery ticket in July last year it's time to start digging through your pockets and purses.
High pressure means little change to our weather! Dull and dreary, but generally dry!