Ahead of the elections, Taiwanese prosecutors warned village and borough chiefs to be wary of overtures from foreign forces, sparking controversy over "political intimidation." Behind the dispute, however, lie genuine concerns about Chinese Communist Party infiltration at the grassroots level.

• Ming Chu-cheng, professor emeritus of political science at National Taiwan University, warned that the CCP may use sponsored tours, financial benefits or sexual blackmail to control borough chiefs, and then send organised crime figures to apply pressure and mobilise voters.
• Although voting is by secret ballot, the count for each borough is made public, allowing the Chinese side to assess the results of its mobilisation efforts. Borough chiefs who fail to deliver votes could be held to account.
• Prosecutors are focusing on borough chiefs not because of their single vote, but because borough chiefs know local networks well and can rally groups together, spreading their influence across an entire community.
• Cultural and historical researcher Hsu Tsung-mao criticised the prosecutors' letters as using the machinery of justice to create panic and frighten those at the grassroots level.
• There is legal precedent: in the Lin Hsueh-feng case, the Taiwan Affairs Office of Taizhou, China, funded trips to China for village and borough chiefs and asked them to support particular candidates. The Supreme Court handed down a final sentence of four years under the Anti-Infiltration Act.

Outlook: Such overtures and the accompanying investigative countermeasures are expected to intensify in the run-up to the election, with grassroots borough chiefs remaining a key battleground for both sides.