McTaggart was Danny Greene's cousin and also Vice president of the Celtic Club. In 1975, Greene began muscling in on many of the Cleveland crime family's operations. This greatly angered the Cleveland family leadership and would later lead to a bloody gang war for control of the city's underworld. McTaggart once allegedly wired dynamite to the frame of rival mobster, Thomas Sinito's car. Sinito found the bomb in his car, removed it and later destroyed it. On October 6, 1977, Greene was killed by a car bomb, effectively ending the gang war.