col·lude 
/kəˈlu:d/ verb
col·ludes; col·lud·ed; col·lud·ing /kəˈlu:d/ verb [no obj] : to work with others secretly especially in order to do something illegal or dishonest
▪ The two companies had colluded to fix prices. — often + in or with ▪ She colluded in misleading the public. ▪ He is accused of colluding with criminals.
▪ The two companies had colluded to fix prices. — often + in or with ▪ She colluded in misleading the public. ▪ He is accused of colluding with criminals.
