
A source from the coalition said that at least 5,000 participants are expected at Lumpini Park, at 6.30am, mostly being employees of the participating organisations.
"We indeed expect at least 10,000, to show our power against the corruption," she said.
The general public is being urged to join.
The private sector is convinced that the political instability that has swamped Thailand in the past five years stems from widespread corruption.
The Office of Securities and Exchange Commission is a strong ally of this coalition. The officials and staff wear the anti-corruption T-shirt on Fridays.