By most accounts, she was supportive of Mussolini and fascism until at least 1937, but according to biographer Stacy Spaulding, when Sergio did convert to anti-fascism, her "conversion was authentic and heartfelt.

Frustrated because she believed that "NBC was not about to allow a woman to do news," Sergio began to work for local New York City station WQXR in 1939.

"A Column of the Air" broadcast seven times a week from 1939 to 1946, when WQXR cancelled all its news commentary.

[3] When asked whether her gender made a difference in the quality of her broadcasting, Sergio wrote, "Here, too, women can claim and hold a place.

"[2] Sergio, who had been the subject of extensive FBI surveillance since she immigrated to the United States, was blacklisted by the American Legion in 1949 and listed in the anti-communist publication Red Channels in 1950.