Alderman Dale Hodges testified Wednesday at the trial of Ken Szczerba, a former president of the Hells Angels in Calgary.
Szczerba is charged with planning to blow up Hodges' home and that of two other Calgary residents.
Police were informed of the alleged scheme shortly after the city ordered the demolition of the bikers' Bowness clubhouse.
On Tuesday, defence lawyer Hersh Wolch questioned the credibility of police informant Tony Vaughn.
Vaughn was paid $350 a week to collect evidence that would lead to charges against Szczerba.
Wolch told the court that Vaughn has an extensive criminal record and was in trouble with the law even while he was being paid by police as an informant.
Four witnesses are expected to testify at the trial Wednesday, including Alderman Hodges, and an expert on explosives.