When Manuel Avila Camacho (1897 – 1955) came to power as the president of Mexico (1940 - 1946) he immediately went to work kicking out the Fascist spies from Japan and Germany
"He banned Nazi newspapers and cut Nazis off the air. He squashed the anti-Semitic Gold Shirts of Monterey and purged fifth columnists in key positions. He washed his hands of the Nazis and extended a hearty handclasp to Roosevelt."
You can learn about the Japanese spies in Mexico here.
Another can be read here.