Thailand's Supreme Court has ruled that former PM Thaksin Shinawatra's family should be stripped of more than half a contested $2.3bn fortune.
The court said $1.4bn (£910m) of the assets were gained illegally through conflict of interest when Mr Thaksin was prime minister.
The funds were frozen after Mr Thaksin's elected government was overthrown in a military coup in 2006.
Mr Thaksin, who is living abroad, has denied any wrongdoing.
The Supreme Court said "to seize all the money would be unfair since some of it was made before Thaksin became prime minister".
The court took several hours to deliver its verdict, with security forces on high alert amid government predictions of violence by Mr Thaksin's red-shirted supporters if the court decision went against him.
The judges said that Mr Thaksin shaped government mobile phone and satellite communications policy to benefit his firms.
He abused his power to benefit telecoms company Shin Corp, which he owned then, earning wealth from shares sales in the company through "inappropriate means", they ruled.
They dismissed defence arguments that the anti-corruption commission that instigated the proceedings against Mr Thaksin was illegitimate.
Mr Thaksin addressed his supporters by video from Dubai after the verdict.
He had previously told them he would continue his political fight against the "military-bureaucratic elite" that deposed him - with or without his family fortune.
He has said the money he and his family earned was acquired legally.
Tensions in Thailand remain high. Tens of thousands of extra police have been placed in and around the capital, and in areas of the north-east of the country where some of Mr Thaksin's supporters are based.
There were only small numbers of Thaksin supporters outside the court. The pro-Thaksin United Front for Democracy against Dictatorship (UDD), which leads the red shirts, has said it has no plans for any demonstration until mid-March.
Local media had predicted huge disruption, counting down to what they called "judgement day". The judges looked at whether Mr Thaksin illegally deposited his fortune with family members because he was not allowed to hold company shares while prime minister, and whether his administration implemented policies to benefit his family's businesses. BBC
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