Groups that advocate some form of revolution, but without being egalitarian, are generally not part of the far left.
Since, by definition, most people are not far from the center, the terms far-left and Far-right are normally used to illustrate that someone is an extremist, not in tune with the majority. Far-left is thus sometimes a Pejorative term. For much of the English speaking world, especially Australia and the United States, it is perhaps primarily a perjorative term to indicate a person is extreme or fringe in their Left-wing politics views.
In the majority of present-day countries, the far-left is often about hostility to tradition, Capitalism, and Nationalism. In many nations it is defined as "to the Left of mainstream Communist parties" as communist parties are acceptable in several nations. Hence it includes Maoism, Anti-Revisionists, Anarcho-communism, Anarcho-syndicalism, and others strongly opposed to capitalist governments and institutions. Not all Anarchism is left in any sense, but the varieties that are would generally be considered far-left. In nations where Communist parties are not acceptable, like the United States, it can simply mean to the "Left of the most left-wing member of the Legislature." "Far-Left" can also describe groups who support an intense "cultural revolution" on anti-traditional lines, like the most extreme thinkers in Radical feminism. Sometimes the term "far left" is used pejoratively by those on the right wing to describe any view they perceive as hostile to capitalism. Others on the right-wing may use it to mean someone strongly antitheist even if their politics is otherwise centrist or even to the right.
The far -left is distinct from the Ultra-left, according to whom the far-left are still part of the left wing of capitalism, even if they are prepared to use violence and rebellion to seize power. These groupings oppose Maoism and anarchism as both being based on the terrain of wage labor which they regard as a hallmark of capitalism.
However, the term "far-left" must also be understood as relative to either the speaker or the context in which they are speaking. Two hundred years ago, for example, anyone who supported Secularism and Universal suffrage would be seen as a far-left extremist, but were often referred to as ultra-radicals at the time. Likewise, as mentioned, parties that'd be deemed "far-left" in one nation might be mainstream in another. Although this should not be overstated either as certain "far left" ideals like Anarcho-communism or abolishing private property are arguably no more mainstream now then they were in the nineteenth century.