...[A] number of companies, in particular US multinationals, face difficulties in fully understanding what is expected of them in subscribing to the Compact...[particularly] Principle 3, and...the following reference in the Guide for Business on the labour principles: "Employers should not interfere in workers' decision to associate [or] try to influence their decision in any way..." ...[This] should be interpreted with due consideration of...international law as recently defined by the ILO...[The] ILO Committee on Freedom of Association...in...case no 2683 against the...United States provide[d] relevant clarification concerning the interaction between...freedom of expression and...freedom of association...[According] to the ILO, national legislation providing for the freedom of speech of employers...is compatible with...freedom of association where it...[protects] against ...speech that would interfere with the formation of a labour organization or the selection of a trade union...