A Queens man faces charges that he swindled immigrants out of more than $1 million by posing as a government agent.

Queens prosecutors say Shane Ramsundar flashed a badge, wore a gun and told people he was an undercover Homeland Security agent. They say he extorted $43,000 from one victim by telling him he was on a terrorism watch list and might be deported if he didn’t fork over cash.

Authorities say he told others he could get them green cards for a fee.

Prosecutors say Ramsundar also stole hundreds of thousands of dollars from immigrants who thought they were buying real estate in Florida.

Ramsundar is charged with larceny, fraud and impersonating a public servant. His attorney said he was new to the case and couldn’t yet comment.