For the length of 30 days, they could go to Tanzania and live over here if they have a legitimate passport. Beyond 30 days, they would require a Visa traveler for his or her stay. Tanzania e Visa for a 30-day tour is easy to obtain.
Whenever we out to any other nation or any other country we must need a visa along with passport, and every nation needs a particular visa of that country. Preparing a visa was not used to be easy but now it is in just 3 steps.