pamphleteer
US /ˌpæm.flɪˈtɪr/
UK /ˌpæm.flɪˈtɪr/

1.
a person who writes or issues pamphlets, especially on a controversial subject
:
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The political pamphleteer distributed flyers criticizing the government.
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During the revolution, many pamphleteers emerged to spread their ideas.
1.
to write or distribute pamphlets
:
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He spent his youth pamphleteering for various social causes.
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The group plans to pamphleteer outside the city hall next week.