The Haymarket Riot of 1886 is the answer you're looking for. The event was both responsible for the death of 4 anarchist rebels, as well as caused a steady decline of the Knights of Labor, due to the fears associated.
Lemonade may come from medieval Egypt. Although the lemon comes from farther to the east, amd lemonade may have been invented in one of these eastern countries. But the earliest written evidence of lemonade comes from Egypt.
The correct answer is Dwight D. Eisenhower. He referred to the domino theory as a reason to support the liberation of communist countries. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.