SHANGHAI — A group of nine people accused of intentionally tainting China’s dairy supplies this year went on trial Monday in Hebei Province, charged with endangering public security in the country’s worst food safety case in decades.

The nine people are part of a larger group of dairy industry suppliers who government prosecutors say sold some of the poisoned milk that killed at least six children in China this year and sickened nearly 300,000 children nationwide.

In a related case, six other people went on trial last Friday in Hebei Province, also accused of doctoring dairy supplies with melamine, an industrial chemical that gives the appearance of higher protein levels but is believed to cause kidney stones and other ailments in young people.

The trials are the government’s latest attempt to show that it is serious about cracking down on food industry workers who add banned chemicals and other substances to foods in order to bolster their profits.

Lawyers in China say that some of the suspects could face long jail terms or even the death penalty. Last year, the head of China’s Food and Drug Administration was executed after being convicted of corruption and regulatory negligence.

On Wednesday, the former head of the Sanlu Group, one of China’s biggest dairy producers, is expected to go on trial for her role in the dairy scandal, which led to huge recalls of Chinese dairy products around the world this year.

The Sanlu Group, which is based in Hebei Province, one of the biggest dairy producing regions, filed for bankruptcy protection last week.

A group of other Chinese dairy companies said last weekend that they had agreed to compensate victims of the scandal.

China’s fast-growing dairy industry has been crippled by the food poisonings, which affected even the country’s best-known dairy brands.

The Chinese government says many dairy officials have already confessed to selling milk doctored with melamine. In the trials that have opened in recent days, prosecutors said that many of the suspects sold hundreds of tons of “protein powder” doctored with melamine in order to make fatter profits.

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