President Trump’s former campaign manager has repped a slew of 20th century dictators — but nothing could prepare him for battling one Brooklyn neighborhood.

While Paul Manafort lives in a posh Trump Tower condo when he’s in New York, he also owns an investment property: a four-story brownstone at 377 Union St. in Carroll Gardens.

And his neighbors aren’t happy about it.

They complain that the town house, which has long been empty, is an eyesore on their otherwise well-kept street, with piles of unshoveled snow, stinky ginkgo-tree fruit, rusty steel beams and dirty cinder blocks littering the home’s yard.

“It’s been four years empty or being renovated. The backyard is full of debris. I wish proper people would live here,’’ neighbor Stephanie Birkmann griped to The Post on Sunday.

Another local, Stephen Barnes, said it’s “been a dump for years.’’

Manafort is known for heading the so-called “torturers lobby,’’ using his connections with US officials on behalf of infamous human-rights-abusing clients such as Mobutu Sese Seke of Zaire and Vladimir Putin puppet Viktor Yanukovych in Ukraine.

Manafort resigned as Trump’s campaign manager in August amid reports that a pro-Russian Ukrainian political party funneled him $12.7 million. Last week, he was named in leaked US intelligence reports as one of the Trump associates who had contact with Russian agents during the election.

Manafort has denied both claims.

He bought the 22-foot-wide brownstone for $2.9 million in 2012, and then secured the permission to convert the two-family dwelling to a single unit, but never completed the project.

Manafort told The Post last week that he has hired a new architect and expects “to complete construction by the end of the year.”

Additional reporting by C.J. Sullivan

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