▁Karl ▁Marx ' s ▁Das ▁Kap ital . ▁It ▁recon ven ed ▁in ▁Chile ▁where ▁it ▁attract ed ▁some ▁of ▁the ▁main ▁interpre ters ▁of ▁Marx ' s ▁work . ▁ ▁When ▁he ▁studied ▁Political ▁Sciences ▁in ▁Bras ília , ▁The ot ô nio ▁started ▁a ▁line ▁of ▁investigation ▁about ▁the ▁structure ▁of ▁the ▁economic ▁classes ▁of ▁Brazil ▁which ▁cul min ated ▁in ▁his ▁th esis ▁titled ▁The ▁Social ▁Class es ▁in ▁Brazil : ▁first ▁part ▁- ▁the ▁propriet ary , ▁which ▁he ▁finished ▁in ▁ 1 9 6 4 . ▁This ▁investigation ▁served ▁as ▁the ▁basis ▁for ▁his ▁ 1 9 6 2 ▁book ▁Who ▁are ▁the ▁En em ies ▁of ▁the ▁People ▁, ▁in ▁order ▁to ▁clarify ▁the ▁terms ▁in ▁which ▁the ▁class ▁struggle ▁w aged ▁between ▁the ▁popular ▁movement ▁and ▁the ▁fra ctions ▁of ▁the ▁Brazil ian ▁r uling ▁class ▁took ▁place , ▁the ▁context ▁of ▁the ▁re organ ization ▁of ▁the ▁post - war ▁world ▁capital ist ▁system , ▁and ▁to ▁propose ▁the ▁general ▁lines ▁of ▁an ▁economic ▁program ▁dest ined ▁to ▁" car ry ▁forward ▁our ▁development , ▁eliminate ▁mis ery ▁and ▁ill iter acy ", ▁linking ▁basic ▁re forms ▁to ▁social ism . ▁ ▁During ▁these ▁years , ▁he ▁participated ▁in ▁many ▁social ▁movements ▁in ▁the ▁country ▁and ▁went ▁c land est ine ▁after ▁the ▁coup ▁of ▁ 1 9 6 4 . ▁At ▁the ▁peak ▁of ▁his ▁political ▁milit ancy , ▁he ▁participated ▁in ▁the ▁PO LO P , ▁a ▁movement ▁that ▁he ▁helped ▁create ▁in