Akhmed Gisayev, a Memorial employee who had been working with Natalia Estemirova to investigate a sensitive human rights case in the days before her murder in July has experienced a series of menacing events in the past days and weeks. Gisayev, who lives in the Chechen capital, Gronzy, has reported being stopped by armed men in the street, having his flat searched and being under constant surveillance by security services. Read more here