Section 3 is a provision of the Housing and Urban Development Act of 1968 (12 U.S.C. 1701u) that is regulated by the provisions of 24 CFR 75. The purpose of Section 3 is to ensure that economic opportunities, most importantly employment, generated by certain HUD financial assistance shall be directed to low- and very low-income persons, particularly those who are recipients of government assistance for housing of residents of the community in which the Federal assistance is spent. 

HUD's Section 3 requirements

HUD's Section 3 Opportunity Portal is intended to assist recipients of Section 3 covered funding and Section 3 business concerns meet their obligations for employment, hiring, and contracting under the final rule, and serve as a helpful tool in locating or connecting Section 3 business concerns and Section 3 workers within the community.