i have personally heard anecdotes (and seen snapshots) from people in school in the late 80s, early 90s, who were regularly herded into the fields to harvest potatoes (czech republic). they too considered it rather fun for whatever reason.
In the 80s, I went on field trips to learn how to plant vegetables. This was hardly slave labor.
In the 90s in the US, I had to spend 40 hours "campaigning" for candidates, if I wanted to graduate highschool. I wouldn't really call that slave labor, but, I certainly learned a lot more by planting sprouts.
I'm 45 and I used to pick potatoes in the autumn in Scotland when I was at school - the holidays in October were known as the "Tattie Holidays" (tattie being Scots dialect for potato).
