Before becoming a lawyer, Vachss held many front-line positions in child protection. He was a federal investigator in sexually transmitted diseases, and a New York City social-services caseworker. He worked in Biafra, entering the war zone just before the fall of the country. There he worked to find a land route to bring donated food and medical supplies across the border after the seaports were blocked and Red Cross airlifts banned by the Nigerian government; however, all attempts ultimately failed, resulting in rampant starvation.