Six women working as prostitutes were arrested during checks on brothels in Athens on Wednesday.
Officers from the police department that combats human trafficking inspected three brothels in the city.
Two of the six women arrested were discovered not to have residence papers.
The others face other charges relating to prostitution.
A 58-year-old man was arrested in Grevena, northern Greece, on Saturday on suspicion of raping a 28-year-old mentally disabled woman and forcing her to have sex with other men.
The woman had gone missing from her home in nearby Florina around a month earlier.
Police said that the suspect forced the 28-year-old to leave with him and live in his house.
Police in Athens said on Wednesday that they had cracked a prostitution racket following the arrest of three suspects believed to have played a leading role in the organization two Greeks and one Romanian national and two of the women believed to have worked as sex workers, a Russian and a Romanian woman.