I want to fight global poverty. How can I invest in poor entrepreneurs and make a profit, so I can grow the money to help more people?

The more I research ways to fight poverty, the more I am learning that job creation and investing in the poor is a powerful way to fight poverty. I am interested in investing money in small to medium businesses in a way that helps poor entrepreneurs, yet provides a small profit for myself, so I can expand and help more people. I was hoping someone had some resources or advice to share about where to start.