Abstract: Provided herein are compounds of Formulae (I) and (II), and pharmaceutically acceptable salts, solvates, hydrates, polymorphs, co-crystals, tautomers, stereoisomers, isotopically labeled derivatives, prodrugs, and compositions thereof. The compounds described herein bind an E3 ubiquitin ligase (e.g., Cereblon) and induce degradation of a transcription factor (e.g., IKZF1, IKZF3). Also provided are pharmaceutical compositions comprising the compounds, and methods of treating and/or preventing diseases (e.g., proliferative diseases (e.g., cancers (e.g., carcinoma); leukemia, lung cancer, breast cancer, liver cancer, pancreatic cancer, gastric cancer, ovarian cancer, colon cancer, colorectal cancer, multiple myeloma, and acute myeloid leukemia (AML))). Further provided are methods of inducing the degradation of a transcription factor (e.g., IKZF1, IKZF3) by administering a compound or composition described herein to a subject and/or to a biological sample (e.g., cell or tissue).