fue

1. third-person singular preterite indicative of ir
2. third-person singular preterite indicative of ser

encarcelado

past participle of encarcelar

en

1. in, at, on
2. in (a time)
3. in (a language)
4. used after some verbs and translated by various prepositions in English
5. in (in various expressions)

el

masculine singular definite article; the

franquismo

Francoism