How to Say "fellow men" in Spanish
The Spanish word for “fellow men” is “próximos” — B1 level.
English → SpanishB1
NounB1formal
humanity in general

Examples
El mandamiento es amar a Dios y a tus próximos.
The commandment is to love God and your neighbors (fellow humans).
Debemos ser solidarios con nuestros próximos.
We must show solidarity with our fellow human beings.
Using the Personal 'a'
Since 'próximos' refers to people, you almost always need the word 'a' when it is the direct receiver of an action (like 'love' or 'help').
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