A scammer posing as a federal agent offered green cards for more than $40,000 and bragged that he could get names removed from deportation and terrorist watch lists, authorities said yesterday.

But Shane Ramsundar didn’t have green cards, real or phony, to deliver and never got a customer for his supposed watch-list-removal service.

He did, however, manage to bilk more than a dozen members of Richmond Hill’s West Indian community of more than $1 million, Queens District Attorney Richard Brown said yesterday.

Ramsundar, 49, also said he could obtain for his clients federally seized real estate on the cheap, according to Brown.

The alleged scammer, who sported a Homeland Security badge and an automatic pistol, “sold” houses in Queens and Florida, assuring his clients they could resell them at a big profit.

But he never delivered the titles, Brown said.

“Immigrants . . . put their faith and their finances in the hands of the defendant who, in turn, allegedly turned their American Dream into the American nightmare,” he said.

Ramsundar is facing charges that could get him 15 years in prison.