In 1932, Plecker gave a keynote speech at the Third International Conference on Eugenics in New York. Among those in attendance was Ernst Rudin of Germany who, 11 months later, would help write Hitler's eugenics law. (Source)
In 1935, Plecker wrote to Walter Gross, the director of Germany's Bureau of Human Betterment and Eugenics. He outlined Virginia's racial purity laws and asked to be put on a mailing list for bulletins from Gross' department. Plecker complimented the Third Reich for sterilizing 600 children in Algeria who were born to German women and black men. "I hope this work is complete and not one has been missed," he wrote. "I sometimes regret that we have not the authority to put some measures in practice in Virginia.