[fabulist]

Most criminals are caught because their groups are targeted and OPSEC (operational security) is really, really hard. They catch the people who didn't maintain strict discipline and get them to flip on the rest. This is an age-old recipe which is resistant to technological change because, again, OPSEC is really, really hard.

[jazzdev]

But what groups are targeted? The new recipe is scanning everyone's online communication to decide who to target.