biggest strikes ever in South African history. In December 1988, Ramaphosa and other prominent members of the Soweto community met Soweto's mayor to discuss the rent boycott crisis. In 1985, the NUM broke away from CUSA and helped to establish the Congress of South African Trade Unions (COSATU). When COSATU joined forces with the United Democratic Front (UDF) political movement against the National Party government of P. W. Botha, Ramaphosa took a leading role in what became known as the Mass Democratic Movement (MDM). Ramaphosa has claimed that he is a committed socialist. Rise in the ANC (1990–1996) After the ANC was unbanned in early 1990, Ramaphosa became increasingly close with the organisation. In January 1990, he accompanied released ANC political prisoners to the ANC headquarters in Lusaka, Zambia; and, later, that year, he served as chairman of the National Reception Committee, which coordinated arrangements for Nelson Mandela's release from prison, including concomitant celebratory rallies. Ramaphosa was elected Secretary-General of the ANC at the party's 48th National Conference in Durban in July 1991, and subsequently became head of the ANC's delegation to the negotiations that ended apartheid. He was also a visiting professor of law at Stanford University in October 1991. Following the first fully democratic elections in 1994, he became a Member of Parliament (MP) and was elected the chairperson of its Constitutional Assembly on 24 May 1994, a central role in Mandela's Government of National Unity. He was also re-elected, unopposed, as ANC Secretary-General at the party's 49th National Conference in December 1994. However, in 1996, he resigned from ANC office and from Parliament and announced his retreat from politics, reportedly because he was disappointed that Thabo Mbeki had been anointed Mandela's successor. Business career (1996–2014) After he resigned from politics, Ramaphosa became a businessman, taking advantage of the conducive environment provided by the new Black Economic Empowerment (BEE) policy. Among other positions, he was executive chairman of Shanduka Group, a company he founded, which invested in mineral resources, energy, real estate, banking, insurance, and telecoms (SEACOM). By 2014, Shanduka was worth more than R20-billion, and the Ramaphosa family's Tshivhase Trust was its majority shareholder. Ramaphosa was also a chairman of Bidvest, MTN, and from March 2007, Mondi, a leading international paper and packaging group. His other non-executive directorships included Macsteel Holdings, Alexander Forbes, SABMiller, Lonmin, Anglo American, and Standard Bank. In 2011, Ramaphosa paid for a 20-year