[1][2] Camusso became involved with trade unions in 1975, while studying for a degree in archeology (incomplete), and was an activist for the right to education, coordinating the courses of the 150 hours of FLM in Milan.

She then moved to the regional FIOM in Lombardy, and finally to the national secretariat of the same metalworkers' union CGIL, with expertise in the automotive sector and steel production.

In 2008, Camusso entered the national Confederal Secretary of the CGIL, with responsibility for very different industries: policies of the productive sectors, cooperation, trade and agriculture.

On 8 June 2010 she was elected vice deputy General Secretary of the CGIL, with responsibility for the coordination of cross communication between the departments of the various unions.

[4] On 28 September 2012 she participated in the demonstration in Rome with the secretary of UIL, Luigi Angeletti, against cuts to Public Administration contained in the decree so-called "spending review".