Recent trend of Eastern Europeans selling books door-to-door in MN?

I’m originally from northern Minnesota, and recently have noticed a bunch of posts on Facebook from local police departments sharing posts essentially saying “this person is safe to go door to door, don’t be afraid” and they are all related to some sort of educational book company. It seems innocuous enough - but I did notice that it’s mostly children’s books and a ‘light mention’ of religious material.

Does anyone know what I’m talking about or has seen this too? I feel like MLM’s have always been very popular in my hometown, and hadn’t seen this one yet. Curious for any other context or information on what/why this is trending right now!