Lefty wunderkind Morris Katz allegedly stiffed his Brooklyn landlord for months — racking up $14,000 in unpaid rent — and left the Williamsburg pad stuffed with trash when his lease was up, The Post has learned.

Katz — the 27-year-old nepo baby credited with fueling socialist Mayor Zohran Mamdani’s meteoric rise — missed multiple rent payments and bounced checks during his six-month lease of the top-floor duplex on Lorimer Street, according to two sources with knowledge of the dilemma.

“I don’t get him. He don’t have his priorities in order, that’s for sure,” super Felix Barbosa told The Post while hosing down the sidewalk outside the…

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