In order to prepare for the 1970 general election, Sirimavo Bandaranaike formed a coalition in 1968 with the LSSP and CPSL to oppose the UNP. The new three-party United Front (Samagi Peramuna) announced that it would work toward a "people's government" under the leadership of Bandaranaike and that it would follow a so-called Common Programme, which promised radical structural changes, including land reform, increased rice subsidies, and nationalization of local and foreign banks.

The United Front resurrected communal emotionalism as a timely and potent campaign weapon. It attacked the UNP for its alliance with the two main Tamil political groups, the Federal Party and the Ceylon Workers' Congress. At the same time, the United Front also announced that it would adopt a new constitution to make Sri Lanka a republic and that it would restore "Buddhism to its rightful place." The United Front won 118 of the 135 seats it contested, with the SLFP, the biggestsingle party, winning 90 seats, the LSSP 19, seats and the CPSL 6 seats. The UNP won a meager seventeen seats.

The United Front government moved quickly to implement key features of its Common Programme. The philosophy of the coalition government was seen most transparently from its foreign and economic policies. The United Front issued declarations that it followed a nonaligned path opposed imperialism, colonialism, and racism and supported national liberation movements. The government quickly extended diplomatic relations to the German Democratic Republic (East Germany), the Democratic Republic of Vietnam (then North Vietnam), the Democratic People's Republic of Korea (North Korea), and the Provisional Revolutionary Government of South Vietnam. It also pledged to suspend recognition of Israel. In economic matters, the United Front vowed to put private enterprise in a subsidiary role.

Prime Minister Bandaranaike tolerated the radical left at first and then lost control of it. Sensing mounting unrest, the government declared a state of emergency in March 1971. In April, the People's Liberation Front (Janatha Vimukthi Peramuna--JVP), a Maoist and primarily rural Sinhalese youth movement claiming a membership of more than 10,000, began a "blitzkrieg" operation to take over the government "within 24 hours." The JVP followed a program--known as the Five Lectures--that included an agenda to deal with "Indian expansionism," the island's unstable economic situation, and the inability of the traditionalist leftist leadership to assert power or attract widespread support (an allusion to the LSSP and the CPSL). The JVP threatened to take power by extraparliamentary means. Fierce fighting erupted in the north-central, south-central, and southern rural districts of the island, causing an official estimate of 1,200 dead. Unofficial tallies of the number of dead were much higher. The JVP came perilously close to overthrowing the government but the military finally suppressed the movement and imprisoned JVP's top leadership and about 16,000 suspected insurgents.

In May 1972, the United Front folafd ollowed through on its 1970 campaign promise to promulgate a new constitution to make Sri Lanka a republic. Under the new constitution, the legislative, executive, and judicial branches of government were vested in the National State Assembly. Many important and vocal sectors of society opposed this concentration of power. The 1972 constitution disturbed the UNP, which feared an authoritarian government might emerge because of the new document. The UNP was especially alarmed that a Trotskyite, Dr. Colvin de Silva (Bandaranaike's minister of constitutional affairs), had drafted the constitution.

The distinct lack of protection for the rights of minorities in the new constitution dismayed many sectors of the population. The Tamils were especially disturbed because the 1972 constitution contained no elements of federalism. Instead, a newly conferred status for Buddhism replaced the provisions for minorities provided by Article 29 in the 1948 constitution. The constitution also sanctioned measures that discriminated against Tamil youth in university admissions. Tamil youth were particularly irked by the "standardization" policy that Bandaranaike's government introduced in 1973. The policy made university admissions criteria lower for Sinhalese than for Tamils. The Tamil community--the Federal Party, the Tamil Congress, and other Tamil organizations--reacted collectively against the new atmosphere the new constitution produced, and in May 1972, they founded the Tamil United Front (which became the Tamil United Liberation Front--TULF--in 1976).

By the mid-1970s, the antagonism between the right and left was destroying the United Front coalition. The growing political influence of the right wing led by Sirimavo Bandaranaike's son, Anura, precipitated the expulsion of the LSSP from the United Front in September 1975. The withdrawal of the CPSL in 1977 further weakened the coalition.

Data as of October 1988