If you are a fan of the good old fashion type gangster movies then this should be right up you alley. It is almost a film verité of the February 14, 1929 events that happened in Chicago that led to Al Capone being known by almost every American. Roger Corman's (Pit and the Pendulum, Frankenstein Unbound) rendition tries to be as factual as possible while still looking like a Hollywood movie. He wanted to tell the story while still entertaining people with gunfights and larger-than-life characters. Ingeniously the film uses a narrator to give the viewer background information on each of the characters. So we know who they are and what's involved. Jason Robards plays Al Capone in an over-the-top kind of way, but somehow it works for this character. There are plenty of supporting actors, but all seem to get their own scene and hence a moment to shine. It ends up like a 'docudrama' that does not take itself too seriously.
St. Valentine's Day 1929 turned out to be a day that was not so full of love in Chicago, but rather one of the more violent days in the city's gangster history. Chicago's' two most powerful gangs led by Bugs Moran (Ralph Meeker – The Dirty Dozen) and Al Capone (Jason Robards – Magnolia, Philadelphia) were in competition for control of the lucrative underground bootlegging industry in the city. Capone was planning a Valentine's Day gift for Moran that would put his gang out of commission. The Capone plan involved a fake liquor delivery, a couple of police uniforms and plenty of firepower. After the smoke clears seven of Moran's men are dead in the warehouse. This night became the beginning of the end of the Chicago criminal empire.
-Fox Flix: Compulsion and Murder, Inc. trailer