In wealthier countries, sectors such as agriculture and construction have the highest rates of forced labor. The governments will have to do more than just introduce new laws to try and insure that the plague of modern slavery doesn't spread. In 19 61, astronomer frank drake wrote out an equation to prove there are intelligent people on other planets in our galaxy. He wanted to prove that seeking for extra terrestrial intelligence was not a search for green men or aliens travelling in spaceships.