According to Wikipedia,
Lester Knox Coleman III was an American who was the co-author of the 1993 book Trail of the Octopus: From Beirut to Lockerbie – Inside the DIA, in which he claimed that a secret drug sting enabled terrorists to evade airport security in the 1988 terrorist bombing of Pan American World Airways Flight 103. Coleman claimed he was at one point employed by the United States Drug Enforcement Administration . Coleman further alleged that a compromised American covert drug-operation allowed Iranian-backed terrorists – the PFLP-GC, led by Ahmed Jibril – to slip a Semtex bomb aboard the plane. On September 11, 1997, Coleman stated to a New York Federal court that "...he lied when he claimed that a secret drug sting enabled terrorists to evade airport security in the bombing..." In a plea agreement, Coleman was sentenced to time served, which was five months, and six months' home confinement under electronic monitoring. Conspiracy theories alleging that the federal convictions of Lester Coleman were an effort to silence him and to hide the truth about Pan Am Flight 103 circulated around the internet.