LOS ANGELES - The massive crush of layoffs washing through the United States tech sector is sparking panic among large numbers of immigrants, who are scrambling to stay employed or risk losing their right to live in this country. These workers, primarily Indian nationals, are in the country on temporary visas designed to help U.S. firms employ an exceptionally skilled and educated workforce. Many have been here for years, in some cases decades. An H1B visa holder - who spoke on the condition of anonymity so his parents in India wouldn't find out he had lost his job - voiced frustration that he'd been courted by recruiters in the past, but is now struggling to find a job so he and his wife don't get deported. "It's very hard. ... I've been here 10 years but I'm on the 60-day clock," said the software engineer laid-off by Amazon in January. "For the past two years the market was good and the salaries were getting higher. Now, even though you're experienced you'll have to compromise a lot," he said. "I'll probably end up at a start-up with one-third of my pay. They know I'm desperate, I have no negotiating power."