Kammala jumla mai zuwa: Alecu Constantinescu ya ci gaba da haɗin gwiwa tare da wasu tsoffin membobin PSDMR waɗanda suka ci gaba da sadaukar da kansu ga dalilin ma'aikata, kamar I. C. Frimu, Alexandru Ionescu, Ştefan Gheorghiu, da Mihail Gheorghiu Bujor. A ƙarshen 1902 ya tafi Paris, Faransa, duk da haka ya ci gaba da hulɗa da ƙungiyar ma'aikatan Romania, lokaci-lokaci yana aika labarai ga jaridar gurguzu "1 Mai" ("Ranar Mayu"). Da ya koma Romania a 1904, ya yi aiki tare da Frimu da Bujor zuwa sake fasalin kungiyar kwadago ta Romania. A watan Agusta 1906, taron ƙungiyoyin kwadago da ƙungiyoyin gurguzu sun zaɓi Constantinescu sakatare na Babban kwamiti na ƙungiyoyin kwadago, ƙungiyar ma'aikata ta farko ta Romania. A cikin wannan lokacin ya shiga kwamitin edita na "România Muncitoare", ya zama editan zartarwa. Jaridar ita ce babbar cibiyar gurguzu a lokacin, kuma ta taimaka wajen shirya yajin aiki da yawa. Alecu Constantinescu da kansa ya fara a cikin 1906 yawon shakatawa na biranen Romania, yana taimakawa wajen shirya ma'aikatan gida, da fatan ƙirƙirar ƙungiyar kwadago ta ƙasa ɗaya. A shekara ta 1907, a lokacin
Ya kasance a Paşcani, a Moldavia, daya daga cikin cibiyoyin tawayen. Saboda fafutukar da ya yi a tsakanin ma'aikatan gida don tallafawa manoma an daure shi saboda cin zarafin mai girma, duk da haka kotun Fălticeni ta wanke shi daga tuhumar 'yan makonni bayan haka.