The blockchain is inherently transparent. so yes they can track where you coins have moved.... IF they are tethered to you originally in some way. Most people bought on Coinbase or an exchange that verifies your identity. From there it's easy to see every place the coins move.

Now if you were to buy them from a tumbler or send them through privacy coins and shed the trail, that is a different story.
But then it becomes illegal if they prove you've intentionally tried to conceal your movements.

or maybe you only made a few grand and they will never take notice because they are so busy...
I've dealt with the government before. My main goal in all of life is to stay off their radar.