Do you see fears about overpopulation as a left-wing or right-wing cause?

I'm doing some personal research on immigration restrictionism, and the topic I'm currently reading through is that of overpopulation. Most of the sources I'm reading come from the 80s and 90s, and I can't help but feel like there's been a sea change in how this topic is viewed within the restrictionist community: overpopulation used to commonly cited as an argument for restricting immigration, but now I feel like I'm hearing conservative voices speak out against fears of overpopulation.

Do you think the fear of overpopulation is more a concern on the right, or on the left? Are you personally worried about national overpopulation?