A peaceful means to removing population

Chain gang is all well and good, but for people playing pacifists or ecological maybe it would be a good idea to add a political faction themed chain-gang to each?

Say for industrialists you could consume a (preferrable selectable as opposed to whatever is growing next) population slot to boost your industry for a turn, maybe ecologists could recycle an unwanted population for a food boost?

Religious factions could do well... What most religions do to people they don't want around XD

But more options than just Chain Gang and a means to select which population goes would be nice!