Yes. The US is even more strict with this. The classic is getting deported or being denied entry for doing private au pair arrangements on vistor visa. see also

Yes. The US is even more strict with this. The classic is getting deported or being denied entry for doing private au pair arrangements on vistor visa. see also: https://news.ycombinator.com/item?id=5864427 https://news.ycombinator.com/item?id=5864427