A Republican running to unseat Long Island Rep. Tom Suozzi slammed the incumbent Democrat for proposing a federal tax hike on people making over $400,000. US Air Force veteran Greg Hach said self-styled moderate Suozzi is sounding like socialist New York City Mayor-elect Zohran Mamdani — and labeled him “Taxman Tom.” “There’s no difference between a socialist tax hike and a Suozzi tax hike — they both accelerate the exodus [from New York],” Hach, an attorney, told The Post. “Tom Suozzi wins the