A few quotes from the Rabbi on 'Tzedakah and Healing'
in which he interprets HaLachma 'Ania ("This is the bread of affliction") as what we must provide for the poor
The suffering in Egypt is mentioned first, the eating of the bread of affliction, and then comes a valiant call to those who are in need to come to eat. What does it mean? That one who gives does so generously. Were this a pleasurable food, one would invite poor people to eat, but to invite the poor to bread such as this…And then it repeats, saying "all in need" etc. The Haggadah means to tell us that we must make a Tikun (repair) to abandon slavery for liberty, meaning that Jerusalem is to be redeemed only through charity, as it says in Scripture. This is why it says "all in need", this year we are here, next year in the Land of Israel.
Magid L'Yaakov: A Commentary on the Haggadah, Orot Yahadut HaMaghreb, Lod, p. 78