Palestine/Israel solutions

I am interested in learning more about earlier forms of Zionism that were radical, leftist, and pursuing just solutions to the protection of the Jewish people that don't trample the rights of others, as is currently happening in Israel. What leftist/socialist/marxist Zionist groups used to be active in the US (or anywhere) that proposed something other than the state of Israel as a homeland for the Jews, and what happened to them? What is the history of alternative Zionist movements? Are there forms of Zionism that aren't inherently based on the displacement/discrimination against other groups, as is happening in Palestine now? Are there Zionist groups operating now that have rejected Israel's policies of human rights abuses? How have current alternative Zionist groups articulated solutions to the current crisis in Israel/Palestine?