Answer
Nehru and Patel intervened in Zail Singh's flag satyagraha, a nonviolent civil disobedience movement in India during the 1920s. The satyagraha protested the British colonial rule and aimed to achieve the right to fly the Indian flag. Nehru and Patel were prominent leaders of the Indian National Congress and played crucial roles in negotiating with the British authorities to resolve the satyagraha.