Robert Wright Jr. was a former FBI counter-terrorism agent out of the Chicago Field Office who once spearheaded an intricate investigation into suspected money laundering of terrorist groups by Islamic relief charities, code named "Vulgar Betrayal". By the time the investigation started, Wright noted how top brass at the Chicago and FBI headquarters in Washington DC looked to upend Wright's investigative team, by not providing him with the necessary financing or manpower to further their operation.
Wright would later complain that "FBI management intentionally and repeatedly thwarted and obstructed my attempts to launch a more comprehensive investigation to identify and neutralize terrorists." Information about the Holy Land Foundation, BMI Inc, and their ties to terrorist groups like Al Qaeda and Hamas were intentionally thwarted or mismanaged which led to the abrupt end of the "Vulgar Betrayal" investigation.
Afterwards, Wright would author a detailed book, to which, the FBI prevented him from publishing with threats of criminal prosecution. By 2006 a court ruling would approve of the book's release.
The FBI's PRE-9/11 VULGAR BETRAYAL Volume 1: The TRUE STORY of the FBI's Negligent Closing of the FBI Terrorism Investigation That Could Have Prevented 9/11:
https://www.amazon.com/FBIs-PRE-9-VULGAR-BETRAYAL-Investigation/dp/B0F844KD1Q