Politicians condemned the white rioters, but also suggested that the riots were impart caused by too much immigration. As a result, immigration laws were changed. In 1961, the government announced a law that would limit commonwealth migration. It was passed in July 1962 as the commonwealth immigration act. The acts tried to control the number of immigrants coming to Britain from the commonwealth. Immigrants had to apply for a work voucher before coming to Britain. The fewer skills and qualifications they had, the less likely their application for a work voucher was to succeed.