This is known as the diatonic scale.

Susan B. Anthony

The modern feminist movement became more organized and focused after the second wave of feminism in the 1960s and 1970s. During this time, feminists rallied around issues such as reproductive rights, workplace equality, and gender-based violence. This wave of activism laid the foundation for ongoing feminist organizing and advocacy efforts.

Technically, all you have to do is identify as a feminist. At worst, you'd be a bad feminist (as opposed to not a real feminist) because feminism is a movement, not an organisation. To be a good feminist, you'd have to engage in women's rights advocacy or women's rights activism.

he was very feminist in nature.