Gender is a class condition created by a brutal arrangement of power.
Gender is a hierarchical system which maintains the subordination of females as a class to males as a class through force.
Gender is the chain and patriarchy is the ball cuffed to the ankle of every female child born into this world, a world where every mainstream institution and structure of power is set up to preserve male dominance.
Gender is a material system of power which uses violence and psychological coercion to exploit female labor, sex, reproduction, emotional support, for the benefit of men.
Gender is not natural or voluntary, since no person is naturally subordinate to another. Biological sex is a physical feature of each person, and those deemed female at birth are socialized by the culture into femininity (in other words, ritualized displays of submission to males).
Rachel Ivey and Deep Green Resistance.