The term ultra-leftism has two overlapping uses.

On Illegalism and Ultra-Leftism.

Like the rest of the British communist movement the NCP from the beginning had to deal with what they saw as ultra-leftism and right-wing deviation.

That contradicted Stalin's views and the new Third Period policy of ultra-leftism promoted by the Comintern.

Although these essays display signs of what Vladimir Lenin referred to as "ultra-leftism", they provided Leninism with a substantive philosophical basis.

Arrested by Chen Zaidao during the Wuhan Incident in July 1967 he was purged for "ultra-leftism" shortly afterwards.

Deng believed that Maoism showed the dangers of "ultra-leftism", manifested in the harm perpetrated by the various mass movements that characterized the Maoist era.

From the evidence here, she was a loose cannon of the left, espousing causes in an antagonistic manner that would be called ultra-leftism, were any principles discernible behind her actions.

Ultra-leftism is often associated with leftist sectarianism, in which a socialist current might attempt to put its own short-term interests before the long term interests of the working class and its allies.

Aside from differences on how to assess the changes in China, the RWH also criticized the RCP for ultra-leftism, or left-idealism in their approach to political work in the U.S.

The RCP holds that its line against electoral politics has been vindicated by the dissolution of several of the Marxist-Leninist groups in the Jackson Campaigns, and others' perceived shifts of line away from open advocacy of revolution with "ultra-leftism."

Attempts by Latin American Communists to implement the ultra-leftism and isolationism of the' Third period' (tactics which had been formulated to respond to the very different political conditions prevailing in Europe) resulted in considerable loss of support and influence for many of these parties.

Her opposition to what she regarded as adventurism and ultra-leftism was shown in 1969 when she resigned from the executive together with Conn McCluskey, John McAnerney and Fred Heatley in protest at NICRA involvement with the People's Democracy (PD).