You may wish to check the Isareli Right of Return Law - so Marx if he found a time machine could theoretically move to Tel Aviv and live on stolen Palestinian land. He wouldn't want to though.Update his parents became Lutheran so he couldn't - the Nazis would have gassed him though. We can be certain of that. Jewish ancestry amendmentThe Law of Return was amended in 1970 to extend the right of return to some non-Jews.[8][9] Amendment number 2, 4a, states: The law since 1970 applies to the following groups: Those born Jews according to the Orthodox interpretation; having a Jewish mother or maternal grandmother. Those with Jewish ancestry – having a Jewish father or grandfather. Converts to Judaism (Orthodox, Reform, or Conservative denominations—not secular—though Reform and Conservative conversions must take place outside the state, similar to civil marriages). Jews who have converted to another religion are not eligible to immigrate under the Law of Return, even though they are still Jews according to halakha.