Feminism has always historically come from the left - even the pre-Marxist left of Mary Wollstonecraft. It originated as an oppositional movement, in opposition to the status quo - very much aligned with the broad left and an ideology of going against the grain. (The concept of the "left wing" comes out of the political movements of the French Revolution, and Wollstonecraft was writing at the height of the Revolution and the new ideas percolating through from France to England).
@IwantToRetire your account of past women's liberation conferences is at odds with my experience from the late 1970s. There was no circulation of agendas or likely speakers! It would have been impossible to circulate that information to the 100s of women attending. In my experience of being involved in the movement since around 1976, the VOLUNTEER organisers just got on and tried to invite a wide range of speakers on a wide range topics of the moment & of interest.
And as I keep saying, there have ALWAYS been divisions in the women's movement. It's a grass-roots movement which covers 50% of the population. Of course there will be divisions and differences! Not all women think the same things!
Think of the division and deep differences between suffragists and suffragettes. When I was a baby feminist in the late 70s, it was between lesbian separatists and straight women ("sleeping with the enemy" accusations abounded). Other divisions ran along the lines of suffragists v. suffragettes - disagreements between those advocating change through gradual legal change eg equal pay, legislation against rape in marriage etc, and those looking at direct action and women's separatism.
FiLIA is one volunteer group. There are many others - WDI, WRN, Sex Matters, and so on. I think part of the issue is that more recently, a lot of women have come to feminism as an organised movement & way of thinking in the wake of the assault on women by the transactivist /gender ideology extremists. They're not really experienced in the much wider movement that came out of the second wave. It was telling at FiLIA that many of the activists speaking and attending were of the age of second wavers. A lot of women new to more organised feminism don't know a huge amount about past campaigns, and past iterations of the women's liberation movement. For me, it's the tiny fragment of silver lining from the storm cloud of transactivism, that it has re-vivified a very active women's movement.
But new converts need to understand that the women's movement has never had one ideological or practical throughline. And debate over both tactics and strategies is a constant in feminist groupings and organisations.