Interesting in this context is completely divorced from morally good/bad. Could be any group from any area at any time in history. I’ll start with a few, followers of the cult of pythagoras, contemporary black Hebrew Israelites, antiracist skinheads and the Amish (neo-luddites in general). Don’t be racist or a prick to other people discussing.
Antinatslism was the topic, the meaning of the word is quite literally in the word itself but here’s the definition for you.
Antinatalism is the philosophical and ethical position that assigns a negative value to birth, arguing that procreation is inherently immoral.