His relationships with the Left, especially with Enrico Berlinguer's Communist Party, were the essence of the relationships between labour forces and Italian industry. The social conflicts related to Fiat's policies (some say "politics") always saw Agnelli keeping the leading role; in the 1980s, during the last important trade union action, a dramatic situation in which a strike was blocking all of Fiat's production, he was able to organise the march of 40,000 workers who broke the pickets and re-entered the factories. This marked the demise of the power of trade unions, which to this day have not recovered their influence on Italy's politics and economy. In the 1970s, Fiat and its leaders were attacked, mostly by the Red Brigades, Prima Linea and NAP. Several people working for the group were killed, and trade unions were initially suspected of hiding some of the attackers in their organizations, though the same terrorists later targeted trade unionists like Guido Rossa. Agnelli's politics and the events at Fiat in the 1970s were the subject of Dario Fo's 1981 satirical play Trumpets and Raspberries.