Alongside Gheorghe Cristescu, Alexandru Dobrogeanu-Gherea and others, Flueraș was a delegate to the Second Congress of the Comintern in Moscow, where the matter of the PSR's joining of the international body and its support of Bolshevik lines were debated. The Transylvanian delegates and, as a former member of the Directory Council, Flueraș first and foremost, were the target of Nikolai Bukharin and Christian Rakovsky's attacks, given that they supported a Greater Romania in front of Bolshevik principles; upon their return, Flueraș, Gheorghe Popovici, and others were expelled from the PS (despite Cristescu's reserves) — the remaining group reformed itself as the Romanian Communist Party (PCR).