In the Summer of 1923, IMRO aided by radical officers, organized a coup d'état. The fall of the government was a great success to the power of IMRO. The government was condemned by the Communist International, as well as the absent communist resistance to it. When the communists aided by the federalists did try to revolt in the September Uprising, they were quickly crushed by the government and its IMRO allies. As a result, some of the fleeing federalists placed themselves in Serbian service, others collaborated with the Greeks. Panitsa also had to flee and went in Vienna, where the federalist's leadership began seeking foreign contacts, especially Soviet diplomats. They served as mediators by consecution of secret reconciling negotiations with IMRO. Continuing into 1924 secret negotiations between the federalists, BCP and IMRO representatives were conducted to unite all groups under the goal of independence or autonomy of a Macedonian state. The new position of the IMRO was identical to that of the Balkan communists and won for the MFO the endorsement of its policy by the Comintern. Lately IMRO officially rejected its support of the document and its leaders even denied endorsing it. In the aftermath of the failed agreement (the so-called May Manifesto from 15 May 1924) Todor Alexandrov, as well as key figures of the "Federalists", were assassinated in the subsequent clash. Weakened the organization disappeared as a real entity. Most of its members joined afterwards the IMRO (United) and later the Bulgarian Communist Party.