The document describes an activity called "Dots!" that was part of a presentation on the Cold War. Participants were each given a post-it note secretly marked with either a dot or left blank. They then had to form groups without revealing if they had a dot, with the largest non-dot group winning. If a dot was discovered in a group, that person would win a prize for infiltrating. After the activity, the presenter led a discussion about identifying communists during the 1950s Red Scare in the US.