In New Orleans, street sweeps by Immigration and Customs Enforcement agents this year also led to a protest. On Nov. 14, nearly two dozen demonstrators, including 14 immigrants without legal status, tied up midday traffic at one of the city’s busiest intersections for nearly three hours until the local police arrested them.

“Our people feel they can’t go to the store to buy food or walk their children to school,” said Santos Alvarado, 51, a Honduran construction worker who joined the protest here even though he has legal papers. “We couldn’t be quiet any longer.”

Many immigrants here have been stunned by the arrests, in which some people seemed to be stopped based solely on their Latino appearance, because they had been living here uneventfully since they came in the chaotic days after Hurricane Katrina in 2005 to work on reconstruction.

One of those workers, Jimmy Barraza, was unloading a carful of groceries on Aug. 16 when agents pulled up with pistols drawn, handcuffing him as well as his teenage son, a United States citizen. A mobile fingerprint check of Mr. Barraza, who is also Honduran, revealed an old court order for his deportation.

Mr. Barraza, 28, won release from detention but is still fighting to remain. His wife is a longtime legal immigrant, and he has two other younger children who are American citizens.

“If they deport me,” he said, “who will keep my son in line? Who will support my family?”

Another Honduran, Irma Lemus, was packing fishing rods for a day on the bayou when cruising immigration agents spotted her family and stopped. A fingerprint check revealed that Ms. Lemus, too, had a deportation order.

“They handcuffed me in front of my children,” she recalled, speaking of a son who is 2 and a daughter who is 4.