• 政党せいとう — political party
• 与党よとう — ruling party
• 野党やとう — opposition party
• 党首とうしゅ — party leader
• 悪党あくとう — villain; rogue

党 originally referred to a group of people with shared ancestry or goals. Over time, it came to represent political groups, factions, and cliques. The 儿 (legs) radical may suggest movement or people. In modern Japanese, it is almost always connected to politics and organizations.