The present invention relates to a compound of Formula 1, wherein: (A) is heteroaryl or aryl; each (A′), if present, is independently chosen from aryl, arylalkoxy, arylalkyl, heterocyclyl, aryloxy, halo, alkoxy, haloalkyl, cycloalkyl, haloalkoxy, and cyano, wherein each (A′) is substituted with 0, 1, 2, or 3 substituents independently chosen from halo, haloalkyl, haloalkoxy, aryl, arylalkoxy, alkyl, alkoxy, amido, —CH2C(═0)NH2, heteroaryl, cyano, sulfonyl, and sulfinyl; X is 0, 1, 2, or 3; (B) is a cyclopropyl ring, wherein (A) and (Z) are covalently bonded to different carbon atoms of (B); (Z) is —NH—; (L) is chosen from a single bond, —CH2—, —CH2CH2—, —CH2CH2CH2—, and —CH2CH2CH2CH2—; and (D) is an aliphatic carbocyclic group or benzocycloalkyl, wherein said aliphatic carbocyclic group or said benzocycloalkyl has 0, 1, 2, or 3 substituents independently chosen from —NH2, —NH(C1-C6 alkyl), —N(C1-C6 alkyl)(C1-C6 alkyl), alkyl, halo, amido, cyano, alkoxy, haloalkyl, and haloalkoxy. (A′)X-(A)-(B)—(Z)-(L)-(D) formula (I) The compounds of the invention show activity for inhibiting LSD1, which makes them useful in the treatment or prevention of diseases such as cancer.