why does it seem all nyc politicians all commies?

Possibly because nyc hosts the UN, foreign consulates, foreign tourism agencies and foreign airlines, foreign trade missions and MANY of the employees of these groups are spies. For 70 yrs the communist countries have had thousands of spies located in nyc and these spies have taken over the nyc political system placing communist americans in positions of power and in political office.
If you disagree then come up with a better reason.