Here's the link I forgot:

http://www.thesmokinggun.com/documents/crime/last-great-mafia-social-club-gets-clipped

"The 1966 wiretap, though, yielded nothing of value during the 60 days detectives monitored calls. Future attempts to bug the club--by both the NYPD and FBI--also delivered disappointing results. Gigante and Co. assumed their storefront was always bugged, and acted accordingly."