Possible Clues:

• Belova who is the alter ego of Marvel's Black Widow
• Florence's role in "Black Widow" and "Hawkeye"
• Florence's role in 'Black Widow' and 'Hawkeye'
• ___ Belova a.k.a. Marvel's Black Widow
• -- Posevina, Russina gymnast who won two Olympic gold medals
• Activist Bonner who married Sakharov