The phrase "alleged cooperation" is correct and usable in written English.
It can be used when discussing claims or accusations regarding someone's involvement or collaboration in a particular situation, often in legal or formal contexts.
Example: "The investigation focused on the alleged cooperation between the two companies in manipulating market prices."
Alternatives: "purported collaboration" or "claimed partnership".
He was arrested in December 2013 for his alleged cooperation with foreign satellite stations.
There are 40 lawsuits pending against AT&T, Verizon and other major phone companies over their alleged cooperation in the eavesdropping program.
Two days earlier he travelled to Karachi on assignment for London-based reporter Ian Cobain, who was working on a story about alleged cooperation between Pakistani and British intelligence in the detention and abuse of suspected militants.
In an article published today, Risen uses a selection of 16 of the e-mails to delve deeper into APA's alleged cooperation with CIA.
On January 13 , 2015 the judge dismissed the charges against Solo based on a lack of cooperation from both alleged victims.
Further, Stanford said, it always investigates sexual violence cases when it has cooperation from an alleged victim.
The weekly newspaper Pyi Myanmar quoted the Parliament speaker, Thura Shwe Mann, as telling reporters last week that the armed forces of the two countries cooperated militarily, but "it was not on nuclear cooperation as is being alleged".
It would be shocking to think that the United Nations' own investigative body is reluctant to act on evidence of cooperation between peacekeepers and alleged war criminals.
Cheney's minions are pushing Congress to sponge up Israeli intelligence assessments about purported Syria-North Korea cooperation on a now destroyed, alleged nuclear site.
Australia stayed silent on alleged human rights abuses in Sri Lanka in exchange for cooperation in cracking down on people-smuggling, Colombo's new prime minister Ranil Wickremesinghe said on Monday.
Jarrar has been a high profile advocate for using the International Criminal Court to prosecute alleged Israeli war crimes, and she's been critical of cooperation between Palestinian security forces and Israel.
