In his plane, Perón was accompanied by president Héctor Cámpora, a representative of Peronism's left wing, who had come to power on May 25, 1973, amid popular euphoria and a period of political turmoil.

The tribune had been set up at Puente 12 by Lieutenant-Colonel Jorge Manuel Osinde and other far-right figures of Peronism, such as Alberto Brito Lima and Norma Kennedy.

Members of the Unión Obrera Metalúrgica trade union, the Juventud sindical peronista and other right-wing sectors were also on Perón's tribune, facing the left-wing groups in the crowds (FAR, Montoneros, JP and others — the FAP had disarmed on May 25, 1973).

Italian terrorist Stefano Delle Chiaie, who worked in Operation Gladio but also maintained links with the Chilean DINA and Turkish Grey Wolves member Abdullah Çatlı, was also present at Ezeiza, according to investigations by Spanish judge Baltasar Garzón.

[citation needed] The Peronist right-wing gradually took control of the whole of the trade union organization, placing people close to the leader José Ignacio Rucci.