The ill-tempered clash saw four yellow cards produced as well as a red card for Robinson for his involvement in the brawl, which broke out towards the end of the first half, following Hazell's late charge on Drahm.
Robinson, Drahm and Hazell appeared before an RFU Disciplinary Panel along with Gloucester fly-half Duncan McRae, who was cited by an independent Citing Commissioner.
Robinson was handed a 21-day ban and will be available for Saints' opening Heineken Cup fixture against Llanelli on December 1, while Drahm received 14 days and will ironically be set for selection against Gloucester at Kingsholm.
Hazell also received a 21-day ban, but his sentence was back-dated to start on November 2, meaning he will also be available for the Kingsholm clash. McRae, who has recently moved to the UK from Australia, had his case dismissed.
Northampton are considering whether or not to exercise their right to appeal the panel's decision.