Ka cika wannan jumla: Hackelman ya gudu zuwa Belgium, inda ya canja sunansa zuwa Arkadiy Harting. Rachkovsky ya sanya Harting zuwa wasu ayyukan da suka shafi tsaro na baƙi na Rasha. Don waɗannan ayyukan, an ba shi lambar yabo daga Rasha da wasu ƙasashe masu masaukin baki. A cikin 1892-1893 an yi masa baftisma kuma ya ɗauki sunan Arkadiy Mikhailovich. A shekara ta 1896 ya canza sunansa zuwa Harding (Гартинг). Daga nan sai ya auri wani dan kasar Belgium Magdalena Pirlot. A cikin 1900, an nada shi shugaban tashar Okhrana Berlin, wanda da farko ya yi aiki a matsayin reshe na Okhrana na Paris a ƙarƙashin Rachkovsky, amma ya fi zaman kansa bayan 1902, lokacin da sabon shugaban, Leonid Rataev ya maye gurbin Rachkovsky. A Berlin Harting ya shirya hanyar sa ido da kutse mai kama da wacce Rachkovsky ke gudanarwa a Paris. Ofaya daga cikin wakilansa shi ne Jacob Zhitomirsky, wanda ya ba da bayanai masu mahimmanci game da ayyukan Social Democratic Labour Party na Rasha da rukunin Bolshevik, gami da kewayen shugaban kwaminisancin Rasha na gaba, Vladimir Lenin. Bayanin Zhitormirsky ya haifar da kama Kamo da 'yan sandan Jamus suka yi saboda rawar da ya taka a cikin
Fashin bankin Tiflis na shekara ta 1907. A cikin 1904, a lokacin Yaƙin Rasha da Japan, an aika da Harting a kan wani aiki wanda ba shi da alaƙa kai tsaye da ayyukan juyin juya hali. Ya kasance don shirya sa ido kan yiwuwar 'yan leƙen asirin Japan a cikin Baltic, don hana katsewar kewayawa na rundunar jiragen ruwa na Rasha zuwa Pacific.