Estrada was convicted of tampering with evidence, which is what he did for his wife's little terrorist cell after they were arrested. The elements of the crime aren't in dispute. "Transporting zines" isn't an accurate summary of that and The Intercept's "reporting" on this is just completely slanted slop.

If you know the government will be interested in documents in your possession in relation to a criminal investigation, it is in fact a crime to destroy or remove them. Regardless of content. As to the sentence term -- this is up to the judge.

And it's all completely unrelated to the Foreign Agents Registration Act, which was the topic of this fine article.