In 2017, Castro, a college senior at the time, made headlines for his outspoken opposition to efforts, driven both by the University of Wisconsin board of regents and several state lawmakers, that sought to punish students who protest or disrupt others' speech. In May, he testified to a capitol panel that legislation being proposed was unjust, saying, "We have the right to assert our humanity when it is questioned." During a news conference, Castro accused school leaders of "capitulating to a bunch of right-wing extremists." He said that such restrictions unfairly affect minority students. In an op-ed, Castro wrote, "Most African American students never forget their first time walking into a lecture hall filled with hundreds of students and being the only black face. It is a chilling and isolating feeling. The voices of people of color on campus are often discouraged, overlooked, and silenced." The bill, which passed later that year, followed a 2016 incident in which conservative columnist Ben Shapiro was shouted down during a campus visit. In May 2019, Castro found himself at the center of news story that drew national attention over a handgun incident in the state capitol. While working as an aide to Shelia Stubbs, a Democratic state lawmaker, Castro was confronted by a Republican lawmaker who displayed a handgun in Stubbs' office. Castro asked the assemblyman, Shae Sortwell, to leave the office. Sortwell complied, but the confrontation ignited a debate about second amendment rights.
School board career
Castro was appointed in July 2019 to replace Mary Burke, a former executive of Trek bicycles, becoming the youngest member ever to serve on the Madison School Board. His appointment also meant that for the first time there were two African Americans sitting on the seven-member board. He told a local reporter that he would seek to build trust "with young parents of color who are moving here who hear that Madison is one of the worst places to raise a black family, that we have a commitment that we are working on it.” Later that year, Castro drew national attention when he spoke out about an incident at West High School, where a security guard had been terminated for using prohibited language, a situation Castro called "incredibly frustrating." In April 2020, he was formally elected to the seat, and currently serves as treasurer to the board.
