Trade Unions at the Heart of Global Efforts to Eradicate this Crime Convention No. 29 on Forced Labour defines it as "any work or service exacted from any person under the menace of any penalty and for which the said person has not offered himself voluntarily." This convention, ratified by 181 countries, is complemented by a comprehensive normative arsenal aimed at combating and eradicating this scourge. These include the Abolition of Forced Labour Convention, 1957 (No. 105), the Labour Inspection Convention, 1947 (No. 81), the Labour Inspection (Agriculture) Convention, 1969 (No. 129), the Private Employment Agencies Convention, 1997 (No. 181), the Migration for Employment Convention (Revised), 1949 (No. 97), and the Migrant Workers (Supplementary Provisions) Convention, 1975 (No. 143).