supported this for ethical reasons, but Mandela instead considered it pragmatic. At a Durban rally on 22 June, Mandela addressed an assembled crowd of 10,000 people, initiating the campaign protests for which he was arrested and briefly interned in Marshall Square prison. These events established Mandela as one of the best-known black political figures in South Africa. With further protests, the ANC's membership grew from 20,000 to 100,000 members; the government responded with mass arrests and introduced the Public Safety Act, 1953 to permit martial law. In May, authorities banned Transvaal ANC president J. B. Marks from making public appearances; unable to maintain his position, he recommended Mandela as his successor. Although Africanists opposed his candidacy, Mandela was elected to be regional president in October. In July 1952, Mandela was arrested under the Suppression of Communism Act and stood trial as one of the 21 accused—among them Moroka, Sisulu and Yusuf Dadoo—in Johannesburg. Found guilty of "statutory communism", a term that the government used to describe most opposition to apartheid, their sentence of nine months' hard labour was suspended for two years. In December, Mandela was given a six-month ban from attending meetings or talking to more than one individual at a time, making his Transvaal ANC presidency impractical, and during this period the Defiance Campaign petered out. In September 1953, Andrew Kunene read out Mandela's "No Easy Walk to Freedom" speech at a Transvaal ANC meeting; the title was taken from a quote by Indian independence leader Jawaharlal Nehru, a seminal influence on Mandela's thought. The speech laid out a contingency plan for a scenario in which the ANC was banned. This Mandela Plan, or M-Plan, involved dividing the organisation into a cell structure with a more centralised leadership. Mandela obtained work as an attorney for the firm Terblanche and Briggish, before moving to the liberal-run Helman and Michel, passing qualification exams to become a full-fledged attorney. In August 1953, Mandela and Tambo opened their own law firm, Mandela and Tambo, operating in downtown Johannesburg. The only African-run law firm in the country, it was popular with aggrieved black people, often dealing with cases of police brutality. Disliked by the authorities, the firm was forced to relocate to a remote location after their office permit was removed under the Group Areas Act; as a result, their clientele dwindled. As a lawyer of aristocratic heritage, Mandela was part of Johannesburg's