"In the years after the [Romanian miner's] strike, the majority of…

"In the years after the [Romanian miner's] strike, the majority of its leaders died of cancer. After 1989, it was revealed that the Securitate [Romanian secret police] had doctors give the strike leaders 5-minute chest X-rays to ensure the development of cancer."

https://en.wikipedia.org/wiki/Nicolae_Ceaușescu#Oil_embargo.2C_strike_and_foreign_relations