The former Norwhich City striker restored the home side lead scoring in 17th minute as he bagged his 14th goal of the season. Earlier Federico Higuian’s goal from the penalty spot put the Crew ahead before Accam tied it for Chicago on a free kick in the ninth.
But Kamara’s goal eight minutes later restored the home side lead. The visitors were reduced to 10-men after Jason Johnson was red-carded for a dive early in the second half and just seven minutes from full time, Ethan Finley capped the scoring for Columbus.
In Finland, Hassan Sesay enjoyed his second full time action since returning from injury as his Lahti side registered a 3-1 home win over ILves in the Finalnd Veikkausliiga.
In Sweden, Mohamed Poborsky Bangura fulltime action could not help AIK who suffered a 3-1 defeat on the road to Helsingborg whilst striker Alhaji Kamara marked his return to the Swedish topflight league for Norrköping who were forced to a 2-2 draw by IFK Goteborg.
Kamara who returned from a loan spell in Malaysia was introduced in the 62nd minute as he replaced Nikola Tkalcic.