The head of a renowned immigration law firm was convicted yesterday on all 57 counts of a federal indictment accusing him of a massive fraud scheme in which illegal immigrants paid thousands of dollars to seek permission to work in the United States, unaware that their applications were filled with false information and phony signatures.

Samuel G. Kooritzky, 64, was led from the courtroom in handcuffs after the verdict, which followed five hours of deliberation and a week-long trial in U.S. District Court in Alexandria. He faces a probable prison sentence of eight to 10 years on charges of conspiracy, fraud and money laundering and could also forfeit as much as $2.5 million that authorities believe was part of the proceeds of his scheme.

Kooritzky owns the Capital Law Centers, with offices in Arlington, Takoma Park and Washington. The firm specialized in applying to state governments for labor certifications, in which a business claims it cannot find a U.S. citizen for a particular job. An immigrant then uses the certification to apply for a permanent resident visa, or "green card."

But Kooritzky's firm submitted thousands of applications for labor certifications without telling the businesses they were being used. Kooritzky filed 230 applications on behalf of two Chili's restaurants in Northern Virginia, 184 applications for one Silver Diner in Arlington, and 173 applications for one Shoney's restaurant in Manassas, ostensibly for cooks and kitchen workers. None of the restaurants had heard of Kooritzky or authorized him to apply for labor certifications on their behalf, their officials testified.

Kooritzky testified that he did not know that his employees and contract workers were preparing phony documents on behalf of his clients.

Kooritzky's own handwritten internal memos and self-adhesive notes were used against him at the trial. In one note, Kooritzky wrote to a colleague, "Please tell me which are real clients and which are 'fake.' " Kooritzky explained that his office used the word "fake" to describe clients who probably wouldn't last through the application process, not to indicate a phony application.

Kooritzky also testified that he knew Chili's had "hundreds of cooks" and that rather than apply through the dozens of different Chili's restaurants, "we simply designated them all from the one location."

Kooritzky said he believed that the restaurants had authorized the applications because one of his employees, Ronald W. Bogardus, told him they had. Bogardus's job at Kooritzky's firm was to find sponsors -- businesses that needed immigrant workers.

For years, Kooritzky said, immigrants came to his office without a job sponsor and he had to turn them away. In the fall of 2000, he met Bogardus, a State Department contract employee, "and it was like a miracle. Exactly the kind of person I was looking for to do that kind of work," Kooritzky said.

Kooritzky schooled Bogardus in the labor and immigration process, and Bogardus went in search of sponsors. But Bogardus testified that he soon found it was easier to simply go to a restaurant, learn the manager's name and then sign the forms himself. For documentation, he and a woman swiped company logos off the Internet and placed them atop phony letters, Bogardus said.

Bogardus or other employees would then sign the restaurant managers' names. He said Kooritzky "told me they could be signed by anybody, and I took him at his word." Bogardus said he did not tell Kooritzky that he was forging signatures. But even after businesses began calling Kooritzky and asking why they were receiving labor certifications for people they had never heard of, Kooritzky did not ask Bogardus about the situation or tell him to stop, Bogardus said.

Andrew Shea, a Labor Department special agent, said in a court filing that Kooritzky filed 2,200 phony labor applications last year alone. Immigrants paid $8,000 to $20,000 for the effort, even though most never got the green card. None of the applicants knew they were being submitted for nonexistent jobs. Nick Pompei, an Internal Revenue Service agent, estimated that Kooritzky's firm reaped more than $10 million from the scheme in the past two years.

Bogardus, 65, and Kooritzky were arrested in July. Bogardus soon pleaded guilty and was sentenced to eight years in prison. He also forfeited $4 million and agreed to testify in hopes of receiving a sentence reduction. Two other Kooritzky employees, Inderjeet Kaur and Carolina Trana, also pleaded guilty and testified, but they have not been sentenced.

Testimony and Kooritzky's internal documents revealed that he paid some businesses as much as $5,000 to sponsor an immigrant.

Kooritzky also argued that filing multiple applications for one person was fine -- a process he said ensured that the applicant would be approved somewhere but that prosecutors said enabled him to maximize his profits by "substituting" other immigrants.

"This is all about buying and selling substitution cases for as much as you can get, isn't it?" Assistant U.S. Attorney John Morton asked Kooritzky.

"Nothing wrong with that," Kooritzky replied.

Brian Shaughnessy, one of Kooritzky's attorneys, argued that "nobody ever brought a forgery to Mr. Kooritzky's attention." Shaughnessy said he would appeal but declined to make further comment.

U.S. Attorney Paul J. McNulty called the case one of the largest labor certification frauds ever prosecuted and said it was "an important victory in our effort to restore integrity to our immigration system."

Samuel G. Kooritzky, arrested in July, faces eight to 10 years in prison for conspiracy, fraud and money laundering.