Honestly, it was kinda laughable. It was so primitive compared to what the 5 eyes routinely do to their own citizens with the aid of social media. Really, they tapped the phone lines but if you said "we shouldn't talk on the phone" that wasn't an admission of guilt or an indication that they should follow you.
And the normal accusation was "mental illness" if you started behaving in ways that the regime didn't approve of. Glenn Greenwald's latest piece [0] on his struggles with corporate media rang the same bell: "Depicting critics of liberal orthodoxies as mentally ill, rage-driven bullies, and shadows of their former selves, is a long-time tactic of guardians of establishment liberalism to expel dissidents from their in-group circles." Replace liberalism with authoritarian socialism and same same.
I was struck by how far we've gone towards something that even the East Germans considered untenable and intrusive.
[0] https://greenwald.substack.com/p/corporate-medias-double-sta...