It's from the movie Tenet
Michael Crosby: I gather you have an interest in a certain Russian national.
Protagonist: Anglo-Russian. So I have to watch my step.
Michael Crosby: Indeed. He's tapped into the intelligence services. I've warned them he's feeding them rubbish...
What's the meaning of "tapped into"? Does it mean that he is an agent of intelligence services or he is just helping them?