Bordigism is a variant of Left communism espoused by Marxist Amadeo Bordiga. He was a founder of the Communist Party of Italy and a prominent figure in the International Communist Party. Bordigists in the Italian Socialist Party would be the first to refuse on principle any participation in parliamentary elections.
Bordiga's version of Leninism led him to promote that socialism was not a society of workers controlling their workplaces, since the workplace would still be the property of the workers. Socialism meant an abolition of property requiring a central social control over all the means of production. Bordiga also saw socialism as an end to social classes, and an end of social classes was to bring an end to the state. A central administration would still be in charge of society's general affairs. This administration would fill its positions not by popular elections, but by a "non-democratic" process where professionals would select who best fits the job. This administration would also plan the economy to benefit humankind.
Bordiga supported the idea of a party organized under principles of organic centralism. A party based in organic centralism was to not vote on and change its principles with the cooperation of its members, instead it would preserve already correct principles with members accepting these principles. The party would also lead the working class and not participate in parliamentary politics.