GRU and KGB first directorate. Also Soviet counter intel was orders of magnitude better, it helps when you can roundup anyone you want and brutalize anyone you want any time you want.

Western intel agencies were like children playing against professionals.

Another example is Mossad orders go magnitude better. Can you imagine Americans, British or hell anyone really pulling off Spring of Youth? Consider the depth of intel needed to pull something like that off. Obviously the Yom Kippur war will be mentioned.. thing was warning were passed to Golda Meir.. Israel should have mobilized and struck first but political decision was made it was not really fault of intel.

GRU and KGB track record is littered with high profile failures.

It is also littered with stunning successes.

So what you say, just like the CIA.

Could you list them please?

Sure, here are some:

Georgi Agabekov, uncovered 400 KGB agents in Iran.

Vladimir Petrov, uncovered 600 KGB agents, including Kim Philby.

Gordievsky, head of KGB residenture in London, exposed all of it.

The failure of Berlin Tunnel.

Polyakov, head of GRU China sector. Exposed 1650 Soviet and 19 foreign GRU agents and operatives.

Penkovsky, provided 7500 pages of documentation on Soviet missile designs and rocket fuel types to CIA.

The KGB had a much harder time recruiting once the realities of life in the Soviet Union became widespread after WW2.

Operation RYAN nearly resulted in a 3rd world war in 1983 - purely based on KGB intelligence failures combined with a paranoid Soviet leadership:

https://en.wikipedia.org/wiki/RYAN