action methods. Starting in the second half of 1919, workers disappointed by the socialist party's and unions' support for the war and previously non-unionized unskilled workers who were radicalized during the war flocked to the FVdG. The revolution also saw the introduction to Germany of industrial unionism along the lines of the IWW with some support from the American organization, but also with links to the left wing of the Communist Party. In December 1919, the Free Workers' Union of Germany (Syndicalists) (, FAUD) was formed, claiming to represent over 110,000 workers, more than eighteen times the FVdG's pre-war membership. Most of the new organization came from the FVdG, but industrial unionists, whose influence was dwindling, were also involved. Rudolf Rocker, an anarchist recently returned to Germany after spending several years in London, wrote the FAUD's program. Class struggle peaked in Italy in the years 1919–1920, which became known as the or red biennium. Throughout this wave of labor radicalism, syndicalists, along with anarchists, formed the most consistently revolutionary faction on the left as socialists sought to rein in workers and prevent unrest. The Italian syndicalist movement had split during the war, as the syndicalist supporters of Italian intervention left USI. The interventionists, led by Alceste de Ambris and Edmondo Rossoni, formed the Italian Union of Labor (, UIL) in 1918. The UIL's national syndicalism emphasized workers' love of labor, self-sacrifice, and the nation rather than anti-capitalist class struggle. Both USI and the UIL grew significantly during the . The first factory occupation of the was carried out by the UIL at a steel plant in Dalmine in February 1919, before the military put an end to it. In July, a strike movement spread through Italy, culminating in a general strike on July 20. While USI supported it and was convinced by the workers' enthusiasm that revolution could be possible, the UIL and the socialists were opposed. The socialists succeeded in curtailing the general strike and it imploded with a day. The government, unsettled by the radicalism on display, reacted with repression against the far left and concessions to workers and peasants. In Portugal, working class unrest picked up from the start of the war. In 1917, radicals began to dominate the labor movement as a result of the war, the dictatorship established that year, and the influence of the Russian Revolution. In November 1918, a general strike was called