The BMA Council last week passed a motion in support of concerns expressed by RCGP chairwoman Dr Clare Gerada about NHS reforms.
GPC member Dr Helena McKeown said the council shared Dr Gerada's fears about the direction of travel of the White Paper.
GPs were particularly concerned over the profession being made responsible for rationing treatment, as well as plans to scale back NICE's role, Dr McKeown said.
Dr Gerada has warned that making GPs ration care could wreck their relationship with patients.
A second motion was also passed that committed the BMA to put together an open letter about these concerns.
Dr McKeown said she expects the most senior 100 names in the profession to be on the list, including members of the BMA council, the RCGP council and GPC members.
'I felt that until today, people were being gradually boiled without noticing,' Dr McKeown said.
Dr David Wrigley, a GP in Lancashire who raised the motions, said this was the next step in tackling the government and health secretary Andrew Lansley over NHS reforms.
He said: 'I have obviously got concerns about the direction for the NHS.
'It's important to highlight the issues raised by Dr Clare Gerada, which the BMA took on board.'