In a statement, Boo said suing an ordinary Pakatan Harapan (PH) member would influence independent investigations by the authorities.
Calling on Fong to wait until the Malaysian Anti-Corruption Commission (MACC) and the police had completed their investigations into the matter, he said an excessive number of lawsuits by politicians against party members and the general public over criticism of their integrity only went against efforts to fight cronyism and corruption.
The controversy arose last week, when the Kuala Lumpur City Hall (DBKL) said it had been forced to approve an application for bazaar lots from PPBM Youth leader Mohd Noorhisyam Abd Karim after receiving a letter of support from Fong.
Noorhisyam was accused of misusing political connections to secure 80 bazaar lots and renting them out for as high as RM5,000 per lot.
However, he reportedly denied taking money from the traders and was quoted as saying that the only funds he collected were to pay for City Hall’s RM6,238 fee.
Fong had said he intended to take legal action against Noorhisyam as he had been tarred by allegations that his name was misused in providing the letter of support.
Boo said Noorhisyam was innocent until proven otherwise in court, but added that as far as public policy was concerned, all parties were open to public scrutiny.
He urged PH leaders to support PPBM Youth leader Syed Saddiq Syed Abdul Rahman, who had said any wrongdoing within the coalition must be reported even if it had been committed by friends or family members.
He also said for PH to be different from the previous Barisan Nasional administration, monitoring and enforcement bodies must be allowed more independence by being answerable to Parliament and the public in the form of a parliamentary ombudsman.