Gadolhadorah – that is exactly the problem. How, in a democracy, do you enact laws that limit religious freedom in general, or for certain specific groups? Most democracies currently regard religion as an area that is strictly “hands off” for government regulation. The supporters of the missionary groups would be very quick to take action. Remember that we’re a tiny minority in the US, so we couldn’t count on the US Congress to help us.
And what about missionizing non-Jews? A Xtian missionizing a Muslim? Muslims missionizing Xtians? Either one trying to missionize a Druze? It gets very, very complicated.