Practically all activities that are legal and protected are surveiled in one way or the other precisely to make sure they stay within the confines of legality.
That's a charitable interpretation. For example, infiltrating groups with undercover officers goes beyond making sure that said group is "legal".
Eh. This is obviously wrong, I must be misunderstanding you. I was cooking dinner earlier, which is a legal and protected activity. In what way was I being surveilled?
Your Blue Apron order data was scraped and compiled to determine that you are in fact Vegetarian /s
Ouch. When anecdotal cherry-picking goes wrong.
And also to arrest the leaders of said protected activities.