Section 209 — Membership of a secret society (angyi)
English translation
Whoever is a member of a body of persons which conceals its methods of operation and has the purpose of doing any unlawful act shall be liable to imprisonment not exceeding seven years, or a fine not exceeding one hundred and forty thousand baht, or both.
If the offender is a leader, manager, or person holding an office in that body of persons, he shall be liable to imprisonment not exceeding ten years, or a fine not exceeding two hundred thousand baht, or both.
This English translation is provided for reference only and has not yet been firm-verified — always rely on the Thai original.
Firm annotation
Opening the chapter on offences relating to public peace, angyi punishes mere membership of a clandestine group. Its elements are: (1) being a member of a body of persons, (2) that conceals its methods of operation, and (3) that has the purpose of doing an unlawful act. Unlike criminal association under Section 210, no plan for a specific offence in Book 2 need be shown; the secret and unlawful character of the organisation is enough, so the offence is complete on membership alone. Paragraph two aggravates the penalty for leaders, managers, and officers. Modern prosecutions have applied it to organised online crime such as illegal gambling networks, where each participant's role is a method of running the concealed enterprise.
Why this matters in practice
Because the offence is complete on membership, prosecutors do not have to prove that any underlying crime was carried out, which makes angyi a common lead charge in organised-crime and online-scam cases; it is not settleable privately. Leaders and officers face the higher bracket, so evidence of one's rank in the group matters. Angyi is frequently stacked with fraud and money-laundering charges, greatly increasing total exposure; see our overview of fraud and scam laws in Thailand.
Supreme Court decisions interpreting this section
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Supreme Court Judgment No. 980/2567 (2024)
Taking part in an online gambling operation by advertising or luring players on a website is a method of committing the secret-society (angyi) offence under Section 209.
In an online gambling prosecution the Court held that arranging play and advertising or luring players through a website was a step in jointly committing the angyi offence. The defendants were convicted under Section 209 paragraph one together with related provisions.
Curated decisions with case numbers verified against the Supreme Court database. English renderings are the firm's editorial translation for study.
Frequently asked questions
What is angyi under Section 209?
Angyi is the offence of being a member of a body of persons that conceals its methods of operation and aims to do unlawful acts. Membership alone is enough for liability.
How does angyi differ from criminal association under Section 210?
Angyi punishes membership of a secret group with unlawful aims without proof of a specific planned crime, while Section 210 requires a conspiracy of five or more to commit a particular Book 2 offence.
Do leaders face a heavier penalty?
Yes. A leader, manager, or officer of the group faces up to ten years or a fine of up to 200,000 baht, higher than the penalty for ordinary members.