 During Nicolae Ceauşescu's communist regime, he worked for the Securitate's Foreign Intelligence Unit (DIE), between 1976 and September 1978.He left DIE in 1978, of his own volition and he became known, in the following decade, for his writings against Ceauşescu's economic policy, which were highlighted on Radio Free Europe (RFE) at the time.In September 2007, the National Council for Analyzing the State Security Department Files (CNSAS) decided that Daniel Dăianu had worked for the External Intelligence Unit solely on economic issues.