"unionized" in the verb sense
1. unionize, unionise
recruit for a union or organize into a union
"We don't allow people to come into our plant and try to unionize the workers"
2. unionize, unionise, organize, organise
form or join a union
"The auto workers decided to unionize"
"unionized" in the adjective sense
1. nonionized, nonionised, unionized, unionised, nonionic
not converted into ions
2. organized, organised, unionized, unionised
being a member of or formed into a labor union
"organized labor"
"unionized workers"
"a unionized shop"
Source: WordNet® (An amazing lexical database of English)
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