Under his leadership , he oversaw the implementation of Operation Intercept , which consisted in searching vehicles entering the United States from Mexico .
In 1969 , Ambrose was appointed as the Commissioner of Customs under President Richard M. Nixon .
Under Ambrose 's leadership , Ambrose oversaw the implementation of Operation Intercept , which consisted in searching vehicles entering the United States from Mexico .
In 1969 , Ambrose was appointed as the Commissioner of Customs under President Richard M. Nixon .