I’ve looked into this. It’s indeed a crime, but heavily criticized one. Most legal systems have abolished or narrowed it. It’s under (very light) fire from lega

I’ve looked into this. It’s indeed a crime, but heavily criticized one. Most legal systems have abolished or narrowed it. It’s under (very light) fire from legal scholars. It’s not archaic - US federal prosecutors still use it. But they insist that the accused actively participated in covering up the crime. Or, at least, had a special obligation to report. So this isn’t obvious or well known, and probably is a good candidate for reform.