Step 1: Recall the 1939 split.
Subhas Chandra Bose won the Congress presidential election in 1939 but soon faced strong opposition from senior party leaders, including Mahatma Gandhi, and resigned from the post.
Step 2: Identify the new party.
After leaving the Indian National Congress, Bose formed the Forward Bloc in 1939 as a new political platform for those who wanted a more radical and immediate push for full independence.
Step 3: Note its goal.
The Forward Bloc aimed to unite left wing and radical nationalist groups under one banner and worked closely with Bose's later efforts, including his role with the Indian National Army.
Final Answer: Forward Bloc.