Publishers are named as the National Movement for Free Elections and the League of Women Voters. Presume also some involvement from the United States Information Agency (USIA), which was an active publisher of posters in the Philippines at the time.
Example on the left of a USIA-sponsored poster from the Philippines:
Also interesting that both the National Movement for Free Elections and the League of Women Voters are mentioned in this State Department report from 1953 history.state.gov
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