A research scientist and a man visiting Boston with an Algerian delegation were among the nine people arrested last week in an undercover prostitution sting focused on the area surrounding the South Bay mall.

Eight of the men were charged with paying for sex, a misdemeanor. A ninth, Raj Kumar Sah, 33, was charged with felony enticement of a child younger than 16.

Those charged with “sex for a fee” include 30-year-old Mohamed Djadoune; 39-year-old Jason Vinci, of Medford; 47-year-old Jose Luis Pinedu Colocho, of Dorchester; 36-year-old Pradeep Mishra, of Shrewsbury; 68-year-old Frederick Williams, of Boston; 24-year-old Juan Jose Galdamez Surio, of Shrewsbury; 62-year-old Konstantinos Mamanidis, of Dedham; and 27-year-old Roberto Pena, of Boston. Court records indicate Surio is also cha

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