The phrase "activities at issue" is correct and usable in written English.
It is typically used in legal or formal contexts to refer to specific activities that are being discussed or examined.
Example: "The court will consider the activities at issue before making a ruling on the case."
Alternatives: "activities in question" or "activities under consideration".
The activities at issue relate to work by Hughes during the 1990's.
And it was while Timothy Rigas was ostensibly running the company that activities at issue in the trial took place.
"You will note there is no mention of Koch among the donors .… We were not involved in any of the activities at issue in California," she said.
"You will note there is no mention of Koch among the donors.… We were not involved in any of the activities at issue in California," she said.
Justice Breyer, in dissent, said the activities at issue "involve the communication and advocacy of political ideas and lawful means of achieving political ends".
22 None of the more "subtle hazards" of underwriting identified in Camp is implicated by the brokerage activities at issue here.
21 In the first place, it is necessary to determine the meaning of the concept of 'communication' and reply to the question whether the activity at issue in the main proceedings comes within its scope.
The purpose of this work is primarily academic -- to document the activity at issue for the benefit of those who seek to help shape policy decisions on related matters.
But in its statement on Friday, Morgan Stanley said, "Based on what we know, we have no reason to believe that the value of any of the properties in any of the funds have been materially affected by the activity at issue".
I choose "at issue" deliberately.
Even assuming that economic activity is at issue in this case, the Government has made no showing in fact that the possession and use of homegrown marijuana for medical purposes, in California or elsewhere, has a substantial effect on interstate commerce.
