The 20,000 MS-13 gang members nationwide is an estimate only, the actual number of members may vary depending upon how well your government guesses, and how many came in last night!
I know. They're a moving and growing target. If we could pick up these 20,000 today, there would be more to pick up tomorrow. And that doesn't include the numbers in the "other" gangs.
We have ourselves a king-sized problem going here, and better figure out how to address it on a scale which matters!