Over 20 African nations boycotted which Olympics protesting against NZ’s rugby team’s tour of South Africa?

In 1976 the All Blacks toured South Africa, with the blessing of the then-newly elected New Zealand Prime Minister, Rob Muldoon. Twenty-five African nations protested against this by boycotting the 1976 Summer Olympics in Montreal. In their view the All Black tour gave tacit support to the apartheid regime in South Africa. The five Maori players on the tour, Billy Bush, Sid Going, Kent Lambert, Bill Osborne and Tane Norton, as well as ethnic-Samoan Bryan Williams, were offered honorary white status in South Africa. Bush asserts that he was deliberately provocative toward the apartheid regime while he was there.

The All Blacks achieved a record of 18 wins and 6 losses, and they lost the test series 3–1.