In order to end marginalization community leaders must come together to figure out how this issue can be put to an end. I think they first need to analyze exactly what the issues are that are causing these problems. For example in India they just have no resources to make homes, or and schools for children to attend, or even clean water. Most villages don't even have medical centers where people can go get treated so there they need to establish a form of producing the capital in order to build these things and provide it. In the article it talks about how everyone is marginalized due to different reasons some are born into it and others eventually get into it. This is why the particular community needs must be assessed first.
Another example is the video of the boys growing up in poverty in New Jersey one of them had a home although it wasn't the best living conditions he had a roof over his head they just lacked the money to put enough food on the table, but however the boy was still attending school. Therefore the needs in that New Jersey community would be way different than those of village in India.
Another thing community leaders can do is educate people the importance of coming together and the difference it can make if everyone works together. For example again of the video in India the entire village had to come together to agree on everyone working together in order to make good use of their loan to help create the foundations they needed to get things going and allowing them to improve. By coming together communities can together face the challenges and come up with solutions. If one single person can make a difference the impact of entire communities around the world would be even greater.