The 1937 cartoon showing Franklin D. Roosevelt with the other two branches is called “The Supreme Court Under Pressure”. It was a cartoon of O. Seibel in 1937. It shows President Roosevelt telling the man representing the Supreme Court, to follow his steps and march or “go on” with the New Deal laws.
It refers to a situation in the same year on the Judicial Procedures Reform Bill, better known as the "court-packing plan". This bill was proposed by Roosevelt to get the acceptation on the recent New Deal legislation. That is why in the cartoon, the artist represents Roosevelt convincingly roll-drumming, marching with the Legislative branch and inviting the Judicial branch to follow his steps.
The bill gave President Roosevelt authority to appoint an additional Judge to the Supreme Court, up to a maximum of six, for every jufge over 70 years old. Although the Supreme Court rejected the bill, Roosevelt could establish a majority on the court.