Answer by taking a quote from the following article:

Curtis Mayfield was born on June 3, 1942 in Chicago, Illinois, the son of Marion Washington and Kenneth Mayfield, one of five children. Mayfield's father left the family when Curtis was five; his mother (and maternal grandmother) moved the family into several Chicago public housing projects before settling in Cabrini-Green during his teen years. Mayfield attended Wells Community Academy High School before dropping out his sophomore year. His mother taught him piano and, along with his grandmother, encouraged him to enjoy gospel music.

Mayfield's career began in 1956 when he joined the Roosters with Arthur and Richard Brooks and Jerry Butler. Two years later the Roosters, now including Sam Gooden, became the Impressions. The band had two hit singles with Butler, "For Your Precious Love" and "Come Back My Love", then Butler left. Mayfield temporarily went with him, co-writing and performing on Butler's next hit, "He Will Break Your Heart", before returning to the Impressions with the group signing for ABC Records and working with the label's Chicago-based producer/A&R manager, Johnny Pate.  Butler was replaced by Fred Cash, a returning original Roosters member, and Mayfield became lead singer, frequently composing for the band, starting with "Gypsy Woman", a Top 20 Pop hit. Their hit "Amen" (Top 10), an updated version of an old gospel tune, was included in the soundtrack of the 1963 United Artists film Lilies of the Field, which starred Sidney Poitier. The Impressions reached the height of their popularity in the mid-to-late-'60s with a string of Mayfield compositions that included "Keep On Pushing," "People Get Ready", "It's All Right" (Top 10), the up-tempo "Talking about My Baby"(Top 20) and "Woman's Got Soul".  He formed his own label, Curtom Records in Chicago in 1968 and the Impressions joined him to continue their run of hits including "Fool For You," "This is My Country", "Choice Of Colors" and "Check Out Your Mind." Mayfield had written much of the soundtrack of the Civil Rights Movement in the early 1960s, but by the end of the decade, he was a pioneering voice in the black pride movement along with James Brown and Sly Stone. Mayfield's "We're a Winner" was their last major hit for ABC. A Number 1 soul hit which also reached the Billboard pop Top 20, it became an anthem of the black power and black pride movements when it was released in late 1967, much as his earlier "Keep on Pushing" (whose title is quoted in the lyrics of "We're a Winner" and also in "Move On Up") had been an anthem for Martin Luther King, Jr. and the Civil Rights Movement.  Mayfield was a prolific songwriter in Chicago even outside his work for the Impressions, writing and producing scores of hits for many other artists. He also owned the Mayfield and Windy C labels which were distributed by Cameo-Parkway, and was a partner in the Curtom (first independent, then distributed by Buddah then Warner Bros and finally RSO) and Thomas labels (first independent, then distributed by Atlantic, then independent again and finally Buddah).  Among Mayfield's greatest songwriting successes were three hits that he wrote for Jerry Butler on Vee Jay ("He Will Break Your Heart", "Find Another Girl" and "I'm A-Tellin' You"). His harmony vocals are very prominent. He also had great success writing and arranging Jan Bradley's "Mama Didn't Lie". Starting in 1963, he was heavily involved in writing and arranging for OKeh Records (with Carl Davis producing), which included hits by Major Lance, Walter Jackson, Billy Butler and the Artistics. This arrangement ran through 1965.

Who did he sign to Curtom Records?
the Impressions joined him to continue their run of hits