It's been argued that contemporary mutualism is largely an Internet based movement and has lacked any relevance since the mid-19th century. However, it is worth remembering that if it wasn't for Mutualism, there would be no worker unions or co-operative federations.
To begin with, in 1857, Eugene Varlin founded a bookbinders' mutual aid society, becoming the nucleus of a bookbinders' trade union + he founded the bookbinders' mutual savings and credit association, organised along Proudhonist lines. Believing in sexual equality, he promoted the anarchist feminist Nathalie Lemel within the credit union. The Workers' Mutual Help Association was formed in Bologna, 1860 to safeguard employment, education, right to strike and universal suffrage. The International Workingmen’s Association was established by the Proudhonist Henri Tolain in July 1863, of which Varlin was a member.
Varlin organised the very first strike of the Parisian bookbinders in 1864 which was a success. In 1867 he and Nathalie Lemel started a co-operative La Ménagère. In 1868 Varlin and Lemel co-founded the co-operative restaurant La Marmite, which remained in business until after the Paris Commune. Varlin believed that trade unions should overcome their professional, local and national sectarianism to form a united international labour movement, dedicated, "to the constant improvement of the conditions of existence of ... the workers of all professions and all countries and to [bringing] workers into possession of the instruments of their labour", as the statutes of his bookbinders' union put it.