You mean like stop the war? or public education? environmental policy?
(What war?) In any case, a few obvious observations at the outset: Socialism qua socialism, at least in its large scale internationalist manifestations, have never been against war per se (although there have been numbers of radical pacifists within various socialist/communist movements over the last century), but only against certain wars for certain purposes.
Contemporary public education is widely understood to have been in a desperate state of intellectual decline for at least several decades, and critically politicized.
Well you should mention environmental policy, as the environmental policies of the Left are socialism in practice, for most intents and purposes.
Interestingly enough, none of the three points you mention are in any sense the unique province of the Left. Few people want war, and even fewer want a polluted environment. Public educations would probably work well if it were returned to a strictly local prerogative, the federal government taken completely out of public education, and the power of the teacher's unions broken.
Its what the Left believes about these issues, and what it does with its power when in power relative to them, that is the question.