The David Suzuki Foundation's charitable status needs to be reviewed, the group EthicalOil.org says.
The group wrote to the Canada Revenue Agency (CRA) on Tuesday, saying there's been "mounting evidence of political and partisan activity."
Registered charities are prohibited from engaging in partisan activity.
"The David Suzuki Foundation is a highly political organization. With the mounting evidence of partisan and political activity, it is time for the Canada Revenue Agency to investigate," EthicalOil.org spokesman Jordan Graham said in the release.
In a 44-page letter e-mailed to the CRA, the oil lobby group details political and partisan activity it says the David Suzuki Foundation took part in. It says that includes Suzuki endorsing Ontario Premier Dalton McGuinty's record and appearing in a Liberal advertisement, persistent calls to political action, frequent condemnation of government policy, and trying to sway the senate to abandon their inquiry on foreign funding of charities.
"With 12 registered lobbyists, the David Suzuki Foundation has more lobbyists on staff than most government relations firms," the release from EthicalOil.org said.
David Suzuki Foundation's director of communications James Boothroyd said the move by EthicalOil.org is not a surprise.
"We are proud of the work we do at the David Suzuki Foundation, especially given the overwhelming support we receive from people all across Canada. We also take great care to ensure that we operate within the guidelines of the Canada Revenue Agency and that we are transparent in our financial records," Boothroyd said in a written statement sent to QMI Agency. "It is not surprising that Ethical Oil, a front group for the tarsands industry, would like to see the David Suzuki Foundation lose its charitable status. We see this as part of a sustained campaign to silence Canada's environmental voices."