Alibaba Group, the world’s biggest e-commerce company, was fined 18.3 billion yuan ($2.8 billion) by Chinese regulators on Saturday for anti-competitive tactics, as the ruling Communist Party tightens control over fast-growing tech industries.

Alibaba was fined for “abusing its dominant position” to limit competition by retailers that use its platforms and hindering “free circulation” of goods, the State Administration for Market Regulation announced. It said the fine was equal to 4% of its total 2019 sales of 455.712 billion yuan ($69.5 billion).