###At least 20 teachers in California’s K-12 schools are facing disciplinary action after they made derogatory comments about right-wing political activist Charlie Kirk in the wake of his assasination last month. Most of the disciplinary investigations are based on comments that teachers made on social media during non-working hours, a possible violation of their right to free speech, said David Goldberg, president of the California Teachers Association, the state’s largest teachers union. In California, state laws protecting free speech and strong union contracts have so far kept the numbers relatively low. A middle school teacher apparently called Kirk “a piece of s — ,” among other things, on their personal social media account, prompting a swift backlash from parents and others. Students could lose their teacher midway through a school year, and teachers “could have their lives turned upside down,” he said.