In 1947, the newly formed United Gold Coast Convention (UGCC) led by "The Big Six" called for "self-government within the shortest possible time" following the Gold Coast legislative election, 1946. Kwame Nkrumah, a Ghanaian nationalist who led Ghana from 1957 to 1966 as the country's first Prime Minister and President, formed the Convention People's Party (CPP) in 1949 with the motto "self-government now". The party initiated a "positive action" campaign involving non-violent protests, strikes and non-cooperation with the British authorities. Nkrumah was arrested and sentenced to one year imprisonment during this time. In the Gold Coast's February 1951 general election, he was elected to Parliament and released from prison to become leader of government business. He became Prime Minister of the Gold Coast in 1952. He improved the infrastructure of the country and his Africanisation policies created better career opportunities for Ghanaians.