Aliens with ability to assume human form among us?

www.telegraph.co.uk/news/newstopics/howaboutthat/ufo/9392888/The-UFO-Files-aliens-might-come-here-for-holidays.html
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The Aliens have assumed the appearance of Romanian Gypsies but are actually from a highly advanced civilisation on another planet in another galaxy which has warp drive technology

In modest budget 1950s science fiction films the invading Aliens often had the power to assume human form. Maybe many of those migrants outside Lunar  House immigration office are in reality from somewhere far away.