The move follows a US$38 million suit by Tesco Lotus against two journalists from the Krungthep Turakij magazine and Jit Siratranont, vice general secretary for the Thai Chamber of Commerce, and ex-member of parliament.
The trio had questioned the hypermarket chain's rapid expansion in the country, which threatens the livelihood of smaller local stores and retail chains.
TJA vice president Wanchai Wongmeechai believes that "Tesco Lotus is exploiting the legal system to silence the freedom of the press in presenting facts and criticisms about its business plans and effects on communities."
Under the FBA, foreign firms need to register with a Thai counterpart to operate in the country and foreign interests in a local company cannot exceed 49 per cent.
Meanwhile, British writers' group, PEN, has published a letter in The Times to condemn Tesco's latest actions as "an unsettling message around the world."
