For the next fifteen years, agents filed classified reports about Mailer's appearances, talks, and lectures.
For three years agents attended public demonstrations and meetings, seized literature and had it translated, and reported on the "anti-Reagan" slogans chanted at rallies.
For three years, agents had suspected Dr. Lee of giving China information on America's most sophisticated nuclear warhead, the W-88.
After tracking the six suspects for two years, federal agents arrested them early Wednesday in New York, New Jersey, Virginia and Texas.
For about two years now, agents with the Federal Bureau of Investigation's Behavioral Analysis Unit have been consulting with their colleagues in New York who specialize in securities fraud detective work.
Barley spent two years studying free agents in Silicon Valley.
About two years later, F.B.I. agents working on an international terrorism case asked to meet with him.
For almost two years, the undercover agents and their network of informants have snooped around streets in Serbia and traveled through the mountains in Bosnia.
And how much is at stake if the owners lock out players when the current deal expires in two years, as many agents and players suspect owners are already preparing to do?
According to the Des Moines Register, who learned of the nine-month surveillance operation two years later, FBI agents staked out activists' homes, secretly photographed them, went through their trash, and monitored their cell records.
