How to Say "rank-and-file member" in Spanish
The Spanish word for “rank-and-file member” is “militante” — B1 level.

Examples
El partido pidió el voto de todos sus militantes.
The party asked for the vote of all its members.
Es una militante activa de la Cruz Roja.
She is an active member of the Red Cross.
Los militantes se reunieron en la plaza para la protesta.
The activists gathered in the square for the protest.
One word for both genders
The word stays the same for men and women. You just change the small word before it: 'el militante' for a man and 'la militante' for a woman.
More than just a member
While 'miembro' is any member, a 'militante' is usually someone very active who works hard for their group's goals.
Militante vs. Militant
Mistake: “Using 'militante' to describe someone aggressive or violent.”
Correction: In Spanish, 'militante' is a neutral word for a party member. If you mean 'militant' in a violent sense, use 'violento' or 'guerrillero'.
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