This Chapter provide for the setting up of a Fund for the additional financial compensation of persons who have suffered economically from expropriation for the benefit of the United States of America in the past and have not been sufficiently compensated before. The Fund shall grant loans, or guarantees of loans or grants-in-aid to landowners, or to defer costs or fees of professional services required by those landowners or class of landowners whose land, rights in land or interest in land wer