Hoare was Secretary of State for Air during most of the 1920s. As Secretary of State for India in the early 1930s, he authored the Government of India Act 1935, which granted self-government at a provincial level to India. He was most famous for serving as Foreign Secretary in 1935, when he authored the Hoare–Laval Pact with French Prime Minister Pierre Laval. This partially recognised the Italian conquest of Abyssinia (modern Ethiopia) and Hoare was forced to resign by the ensuing public outcry. In 1936 he returned to the Cabinet as First Lord of the Admiralty, then served as Home Secretary from 1937 to 1939 and was again briefly Secretary of State for Air in 1940. He was seen as a leading "appeaser" and his removal from office (along with that of Sir John Simon and the removal of Neville Chamberlain as Prime Minister) was a condition of Labour's agreement to serve in a coalition government in May 1940.