emigrate vs. immigrate vs. migrate

https://en.wikipedia.org/wiki/Migration

International
http://www.iom.int/

Policy
http://www.migrationpolicy.org/

Site
http://www.immigration.com

Forced
http://www.forcedmigration.org

Help
http://www.immihelp.com/

Justice
https://www.immigrantjustice.org/

Rights

https://www.migrant-rights.org/

Voc
http://www.vocabulary.com/articles/chooseyourwords/emigrate-immigrate-migrate/

Vs Refugee
http://edition.cnn.com/2014/07/15/us/immigrant-refugee-definition/