The St. Valentine’s Day Massacre: A Historical Investigation is a comprehensive student packet and teacher guide designed for grades 10–12. This resource examines the 1929 Saint Valentine’s Day Massacre as a case study in systems, evidence, media framing, and historical uncertainty during the Prohibition era.

Rather than presenting the event as a sensational crime story, this investigation asks students to analyze how laws, public behavior, organized crime, and media reporting interacted, and why key historical questions remain unresolved.

Students engage with nine nonfiction reading passages, structured annotation systems, evidence-tracking tools, media analysis, and writing tasks that emphasize critical reading and disciplined historical thinking.

The materials are modular and may be used as:
A one-day Valentine’s Day lesson
A multi-day mini-unit
Or a selective investigation, with teachers choosing specific passages or activities

No prior background knowledge is required.

Instructional Focus
Students are guided to:
Analyze cause-and-consequence relationships created by Prohibition-era policies
Distinguish between evidence, inference, speculation, and uncertainty
Examine how media language and framing shape public understanding
Understand organized crime as structured power within systems, not chaos
Recognize how historical narratives persist even without closure

What’s Included
Student Packet:
Student introduction and content note
“What to Watch For” analytical reading guide
Pre-reading activities:
Headline vs. History
Anticipation Guide: Law, Violence, and Public Memory

9 reading passages:
Prohibition: When a Law Created a Market
Chicago as a Battleground
The North Side Gang
South Side Power: Capone’s Organization
February 14, 1929: The Saint Valentine’s Day Massacre
Suspects, Not Convictions
Reading the Headlines
The Law Responds
Myth, Memory, and True Crime

Annotation symbol key and recording sheets
Evidence tracking (color-coded highlighting)
Text-dependent questions for each passage
Timeline and historical reasoning tasks
Media primary-source comparison activities
Reflection activities and exit tickets
Capstone writing prompt menu and rubric

Teacher Packet:
Complete teacher guide explaining what each component is and how to use it
Suggested pacing options (1-day, 2-day, or multi-day use)
Substitute-ready quick start guide
Teaching notes and flexibility statement
Content-sensitivity disclaimer
Standards alignment (CCSS RI.11–12 and Virginia English SOLs)