[jmacusa]

Did FDR use this power to deny Japanese, Italian and German-Americans their rights during WW2? Could George Bush have done so after 9/11?

[BroJoeK]

jmacusa: "Did FDR use this power to deny Japanese, Italian and German-Americans their rights during WW2?"

This link discusses habeas corpus during World War II.
It does mention other examples of habeas corpus being suspended, but not those you name.

This link discusses internment of German-Americans during World Wars One & Two, but does not discuss the issue of habeas corpus.

This link discusses internment of Japanese-Americans during World War Two, and mentions the ex parte Endo (1944) case in which the Supreme Court ruled the War Relocation Authority (WRA) could not deny habeas corpus to civilians.

jmacusa: "Could George Bush have done so after 9/11?"

So far as I know, the "Patriot Act" does not deny habeas corpus to any Americans.