In October 1976, López Michelsen imposed a state of siege following two months of strikes by social security employees. The continuing discontent with the government erupted again in September 1977 when the four major labor unions joined in a strike to protest the high cost of living. Under the state of siege measures still in effect, the administration declared the strike illegal. Riots following the government's attempt to suppress the strike resulted in twenty deaths. Several cabinet ministers resigned in protest over the way the strike had been handled.