In the UK, you're looking for JTRIG, Institute for Statecraft/Integrity Initiative, and the 77th Brigade, and probably tens to hundreds of smaller organizations.

For Russia it would be the FSB and the various gray area semi-government controlled propaganda/disinformation groups.

China has the Ministry of State Security, MSS.

The UK has the SIS.

Germany has the BND.

The Dutch are also pretty capable with the AIVD.

They all fund nonprofits and groups to help spread good and bad propaganda.

Russia would be the Kremlin