In 1964 Labour returned to power after 13 years of Conservative rule but the new government under Harold Wilson pursued policies seen by many leftists as anti-union (including an attempt to introduce "In Place of Strife" compulsory arbitration), while in Northern Ireland the government was seen by many in the Catholic community as supporting its oppression following the collapse of the civil rights campaign. The Tories, under Edward Heath, returned to power in 1970 with policies even more unpopular with the British left, contributing to the largest number of strikes involving the greatest number of workers in British history. Miners' strikes in 1972 and 1974 featured widespread participation from the working class and other sectors. Heath was defeated in 1974 and in the eyes of many on the British left, the second Wilson government continued where it left off.