The phrase "alleged to control" is correct and usable in written English.
It can be used in contexts where someone is accused or claimed to have control over something, without confirming the truth of that claim.
Example: "The organization is alleged to control several key resources in the region, raising concerns among local authorities."
Alternatives: "claimed to control" or "reported to control".
It is alleged to maintain control over captured populations through terror, displacement, and murder of those deemed undesirable.
At the peak of Bruneian Empire, Sultan Bolkiah (reigned 1485 1528) is alleged to have had control over most regions of Borneo, including modern-day Sarawak and Sabah, as well as the Sulu archipelago off the northeast tip of Borneo, Seludong (modern-day Manila), and the islands off the northwest tip of Borneo.
Easily the most publicized fraudster of 1999, he is alleged to have gained control of several southern insurance companies, looted their treasuries of in excess of $200 million and accidentally set his Greenwich, Conn.
A deposed dictator, reviled across the world, whose administration has been condemned by human rights groups including Amnesty International and who many allege sought to control the press and see off his opponents in the most ruthless manner, has taken control of a Premiership football club he pretends to be "passionate" about.
The operation is alleged to have spiralled out of control and collapsed without unearthing evidence of guilt.
SeaFrance is alleged to have fallen under the control of a rogue trade union branch, which obstructed a possible sell-off to push its own plan for a workers' co-operative.
One man who is alleged to have breached the conditions of his control order by calling his mother is currently awaiting trial over the breach.
The "good" kind criticized alleged Jewish conspiracies to control newspapers, banks, and other institutions, to care only about accumulation of wealth, etc. Islam and Judaism have a complex relationship.
Last year Mr Lee was accused by Kim Yong-chul, Samsung's former chief lawyer, of controlling a huge slush fund, from which he was alleged to have doled out bribes.
Others environmental factors, including where asylum seekers who are alleged to have perpetrated abuse are allowed to stay, also fall within Australia's control.
