Quebec's anti-corruption squad raided several offices in Laval and the surrounding area on Thursday morning.
One location being raided is Construction Garnier, whose owner Giuseppe 'Joe' Borsellino has been mentioned at the Charbonneau Commission.
Last week former FTQ-Construction leader Jocelyn Dupuis said that he had been asked to intervene in a dispute between Borsellino and construction magnate Tony Accurso.
Police are also targeting Schokbeton in St. Eustache, which is run by a former fundraiser for the provincial Liberal party.
No one has been arrested, but officers have interviewed about 15 people.
